pl_u: Remove printf specifier in log call in a log call in GetSharedFontInOrderOfPriority()

gdbstub: Get rid of a few signed/unsigned comparisons

hid: Resolve a signed/unsigned comparison warning

svc: Correct always true assertion case in SetThreadCoreMask

loader: Amend Doxygen comments

loader/nso: Check if read succeeded in IdentifyFile() before checking magic value

hle/service: Make constructors explicit where applicable

nvflinger: Emplace Display instances directly

nvdrv: Take std::string by const reference in GetDevice()

Filesystem: Return EntryType::Directory for the root directory.

The reason this would never be true is that ideal_processor is a u8 and
THREADPROCESSORID_DEFAULT is an s32. In this case, it boils down to how
arithmetic conversions are performed before performing the comparison.

If an unsigned value has a lesser conversion rank (aka smaller size)
than the signed type being compared, then the unsigned value is promoted
to the signed value (i.e. u8 -> s32 happens before the comparison). No
sign-extension occurs here either.

An alternative phrasing:

Say we have a variable named core and it's given a value of -2.

u8 core = -2;

This becomes 254 due to the lack of sign. During integral promotion to
the signed type, this still remains as 254, and therefore the condition
will always be true, because no matter what value the u8 is given it
will never be -2 in terms of 32 bits.

Now, if one type was a s32 and one was a u32, this would be entirely
different, since they have the same bit width (and the signed type would
be converted to unsigned instead of the other way around) but would
still have its representation preserved in terms of bits, allowing the
comparison to be false in some cases, as opposed to being true all the
time.

---

We also get rid of two signed/unsigned comparison warnings while we're
at it.

This can just use the fmt specifiers and be type-agnostic.

hle_ipc: Amend usage of buffer_index within one of HLERequestContext's WriteBuffer() overloads

 fsp_srv: Misc individual changes

Ensures both operands in comparisons are the same signedness.

Modernizes the loops themselves while also getting rid of a signed/unsigned
comparison in a loop condition.

Gets rid of the use of a magic constant

filesystem: Minor changes

common/swap: Minor changes

common/common_funcs: Remove unused rotation functions

loader/{nro, nso}: Resolve compilation warnings 

It is unknown if this is correct behavior, but it makes sense and fixes a regression with Stardew Valley.

These weren't adjusted when VFS was introduced

common/misc: Deduplicate code in GetLastErrorMsg()

externals: Update Xbyak to 5.65

externals: Update catch to v2.2.3

We should always assume the filesystem is volatile and check each IO
operation. While we're at it reorganize checks so that early-out errors
are near one another.

Prevents implicit construction and makes these lingering non-explicit
constructors consistent with the rest of the other classes in services.

We can use emplace_back to construct the Display instances directly,
instead of constructing them separately and copying them, avoiding the
need to copy std::string and std::vector instances that are part of the
Display struct.

file_util: return string by const reference for GetExeDirectory()

string_util: Remove AsciiToHex()

savedata_factory: Make SaveDataDescriptor's DebugInfo() function a const member function

partition_filesystem: Ensure all class members of PartitionFilesystem are initialized

content_archive: Minor changes

This is only ever used as a lookup into the device map, so we don't need to
take the std::string instance by value here.

Previously, the buffer_index parameter was unused, causing all writes to
use the buffer index of zero, which is not necessarily what is wanted
all the time.

Thankfully, all current usages don't use a buffer index other than zero,
so this just prevents a bug before it has a chance to spring.

We can avoid constructing a std::vector here by simply passing a pointer
to the original data and the size of the copy we wish to perform to the
backend's Write() function instead, avoiding copying the data where it's
otherwise not needed.

We were using a second std::vector as a buffer to convert another
std::vector's data into a byte sequence, however we can just use
pointers to the original data and use them directly with WriteBuffer,
which avoids copying the data at all into a separate std::vector.

We simply cast the pointers to u8* (which is allowed by the standard,
given std::uint8_t is an alias for unsigned char on platforms that we
support).

vfs: Deduplicate accumulation code in VfsDirectory's GetSize()

gl_state: Temporarily disable culling and depth test.