qt/main: Collapse if statement in UpdateRecentFiles()

qt: Don't show error dialog when canceling the Load Folder dialog

qt: Minor cleanup-related changes

kernel/event: Make data members private

gl_rasterizer_cache: Avoid superfluous surface copies.

 core_timing: Make GetGlobalTimeUs() return std::chrono::microseconds

qt/main: Better file-existence checking within OnMenuRecentFile() and UpdateUITheme()

This was intermixing signed and unsigned values when they could all just
be signed.

Given the function accepts a boolean, we don't need to use an if
statement here and repeat ourselves.

In OnMenuRecentFile() we don't need to construct a QFileInfo instance
just to check if a file exists, we can just use the static member
function to do that (which Qt's documentation also notes as quicker than
constructing an instance).

In UpdateUITheme(), we just want to try and open the file and check the
success of that operation. Technically speaking, between the existence
check and the open call, the file can be deleted or moved, but still
appear to succeed in code. i.e.

1. Existence check -> Returns true
2. File is moved/deleted
3. Open is called, the return value of which isn't checked
4. Nonsense behavior

This way we combine the existence check and the open into one.

Previously, when canceling out of the Load Folder dialog, a user would
get an error dialog about the selected folder not containing a main
file, however, by canceling out of the dialog, no selection was actually
made.

These occur automatically without the need to call them. While we're at
it, also std::move the QString instance into its member variable.

Makes code consistent with our style of defaulting special member
functions where applicable.

Instead we can simply provide accessors to the required data instead of
giving external read/write access to the variables directly.

memory: Correct prototype of ZeroBlock

Service/Audio: audout_a.cpp: remove pragma once

core_timing: Use transparent functors where applicable

gdbstub: Minor changes

address_arbiter: Return by value from GetThreadsWaitingOnAddress()

Implement audren audio output

ms is shorthand for milliseconds, not microseconds, and given there's no
comment indicating that this was intentional, it probably wasn't.

Enforces the time unit being returned and also allows using the standard
time utilities to manipulate it.

Keeps the code consistent.

Previously, the prototype wasn't matching the definition, which has a
Processor parameter before the destination address.

These aren't necessary, as value-wise const only matters in the
definition.

Makes the alias a little more readable from left-to-right.

Gets rid of the need to hardcode the type in multiple places. This will
now be deduced automatically, based off the elements in the container
being provided to the algorithm.

gl_shader_decompiler: Fix TEXS mask and dest.

Rather than having to type out the full std::map type signature, we can
just use a straightforward alias. While we're at it, rename
GetBreakpointList to GetBreakpointMap, which makes the name more
accurate. We can also get rid of unnecessary u64 static_casts, since
VAddr is an alias for a u64.

Keeps everything under the same namespace. While we're at it, enclose
them all within an inner anonymous namespace.

video_core: Eliminate the g_renderer global variable

In all cases the vector being supplied is empty, so we can just return
by value in these instances.

In all cases, a virtual address is being passed in, not a physical one.

externals: Update dynarmic to 4f96c63

4f96c63 emit_x64_vector_floating_point: Simplify FPVector{Min,Max}
e15fdfe emit_x64_vector_floating_point: Simplify Get*Vector functions
734a00b emit_x64_floating_point: Remove EmitProcessNaNs
fd45191 devirtualize: Replace DEVIRT macro with function template
67ba5d0 fuzz_with_unicorn: Remove FCVT_float from ignore list
66e6dd1 a32_emit_x64: std::move A32::UserConfig in the constructor
b4890b6 emit_x64_floating_point: Use EmitPostProcessNaNs in EmitFPMulX
18b2943 emit_x64_floating_point: Remove unnecessary DenormalsAreZero from EmitFPSingleToDouble and EmitFPDoubleToSingle
df1f81f emit_x64_floating_point: Simplify EmitFP{Min,Max}{,Numeric}{32,64}
21fb1c3 emit_x64_floating_point: Reduce NaN processing overhead
f5c9f0f A64: Implement FMULX, scalar single/double variant
8f47773 IR: Implement FPMulX IR instruction
79e6440 fuzz_with_unicorn: Randomize SP
33c80e3 fuzz_with_unicorn: Randomize PC
8d41024 testenv: Make code_mem mobile
a9fae0e emit_x64_vector: Vectorize 32-bit variants of paired min/max
8926a92 emit_x64_vector: Improve code emission of VectorGetElement* for index == 0
e20bd38 reg_alloc: Do a UseScratch if a Use destination is too small
a19fa0e fuzz_with_unicorn: Randomize FPCR.AHP and FPCR.FZ16
775f368 emit_x64_floating_point: AVX implementation of ForceToDefaultNaN
71018a1 emit_x64_vector_floating_point: Prefer blendvp{s,d} to vblendvp{s,d} where possible
137f4b3 backend_x64: Remove all use of xmm0
e73d67a emit_x64_vector_floating_point: AVX implementation of ForceToDefaultNaN
43cca54 emit_x64_vector_floating_point: Reduce codesize of ForceToDefaultNaN
5dc40f4 emit_x64_vector_floating_point: Reduce codesize of EmitTwoOpVectorOperation
07622ee emit_x64_vector_floating_point: Correct FMA in FTZ mode
621c85b emit_x64_floating_point: DenormalsAreZero is redundant as hardware already does DAZ
3d0ebaa emit_x64_floating_point: FlushToZero is redundant as hardware already does FTZ
f626ff8 backend_x64: Fix FPVectorMulAdd and FPMulAdd NaN handling with denormals
adeb9d9 a32/fuzz_arm: Disable vfp tests
19ea70d fuzz_with_unicorn: Randomize FPCR.FZ
895db36 backend_x64: Fix bugs when FPCR.FZ=1
d7e2de2 fuzz_with_unicorn: Extract RandomFpcr function
c858d6c fp/info: Deduplicate functions
5b88ec2 emit_x64_floating_point: Deduplicate EmitFPMulAdd implementation