filesys/loader: std::move VirtualFile instances in constructors where applicable

audout_u/audren_u: Ensure null terminators are written out in ListAudioOutsImpl(), ListAudioDeviceName(), and GetActiveAudioDeviceName()

maxwell_3d: Remove unused variable within GetStageTextures()

thread: Convert ThreadStatus into an enum class

partition_filesystem: Return pfs_dirs member variable within GetSubdirectories()

nso: Minor changes

gl_shader_decompiler: Eliminate variable and declaration shadowing

This avoids unnecessary atomic reference count increments and decrements

Avoids potentially unnecessary atomic reference count incrementing and
decrementing, as well as string copying.

gl_shader_decompiler: Remove unnecessary const from return values

pl_u: Simplify WriteBuffer() calls in GetSharedFontInOrderOfPriority()

std::string doesn't include the null-terminator in its data() + size()
range. This ensures that the null-terminator will also be written to the buffer

Uses a type that doesn't potentially dynamically allocate, and ensures
that the name of the interface is properly null-terminated when writing
it to the buffer.

Makes the thread status strongly typed, so implicit conversions can't
happen. It also makes it easier to catch mistakes at compile time.

This should be returned here, otherwise pfs_dirs is effectively only
ever added to, but never read.

Ensures that no identifiers are being hidden, which also reduces
compiler warnings.

This adds nothing from a behavioral point of view, and can inhibit the
move constructor/RVO

With the new overload, we can simply pass the container directly.

hle_ipc: Introduce generic WriteBuffer overload for multiple container types

pl_u: Specify correct size for buffers in GetSharedFontInOrderOfPriority()

HLE/ACC: Change the default user id and small improvements to the way we handle profiles

HLE/ACC: Write a single whole user id in ListAllUsers and ListOpenUsers.

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

The default username for now is "yuzu".
We should eventually allow the creation of users in the emulator and have the ability to modify their parameters.

In IApplicationFunctions::PopLaunchParameter we tell the games that they were launched as user id 1.

We only emulate a single user id for now.

nvflinger: Emplace Display instances directly

This introduces a slightly more generic variant of WriteBuffer().
Notably, this variant doesn't constrain the arguments to only accepting
std::vector instances. It accepts whatever adheres to the
ContiguousContainer concept in the C++ standard library.

This essentially means, std::array, std::string, and std::vector can be
used directly with this interface. The interface no longer forces you to
solely use containers that dynamically allocate.

To ensure our overloads play nice with one another, we only enable the
container-based WriteBuffer if the argument is not a pointer, otherwise
we fall back to the pointer-based one.

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

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

This WriteBuffer overload expects its size argument to be in bytes, not
elements.