shader/registry: Make use of designated initializers where applicable 

vk_command_pool: Add missing header guard

audio_core: Remove unnecessary inclusions

behavior_info: Fix typo Renerer -> Renderer

Same behavior, but removes header dependencies where they don't need to
be.

Allows the implementation details to be changed without recompiling any
files that include this header.

service: Restore "unused" function

Turns out this function is actually used, but within a trace log.

arithmetic_integer_immediate: Make use of std::move where applicable

acc: Partially implement LoadOpenContext

Same behavior, minus any redundant atomic reference count increments and
decrements.

renderer_vulkan: Make unconditional use of VK_KHR_timeline_semaphore

Add automap feature for GC adapter

Using statements already make these unnecessary.

memory: Resolve a -Wdocumentation warning

install_dialog: Remove unused function prototype

game_list: Eliminate redundant argument copies 

Same behavior, less repetition.

memory doesn't exist as a parameter any more.

Allows the compiler to warn against cases where the return value isn't
used (which would be a bug).

This function doesn't have an implementation, so it can be removed to
prevent others from unintentionally using it.

Makes the naming consistent with the rest of the functions that are
present.

Several functions can be taken by const reference to avoid copies

control_flow: Make use of std::move in InsertBranch()

Places data structures where they'll eventually be moved to to avoid
needing to even move them in the first place.

Avoids unnecessary atomic increments and decrements.

General: Make use of std::nullopt where applicable

Allows some implementations to avoid completely zeroing out the internal
buffer of the optional, and instead only set the validity byte within
the structure.

This also makes it consistent how we return empty optionals.

ips_layer: Eliminate a redundant copy in Parse()

Prevents unnecessary copying of the line being parsed.

submission_package: Account for multi-content NSPs

This is used in multiple games such as:
- Clubhouse Games: 51 Worldwide Classics
- Grandia HD Collection
- XCOM 2 Collection
- Baldur's Gate 1/2
- Dr Kawashima's Brain Training
- Super Mario 3D All-Stars

renderer_opengl: Remove emulated mailbox presentation

hid: Implement Get/SetNpadHandheldActivationMode

Emulated mailbox presentation was causing performance issues on
Nvidia's OpenGL driver. Remove it.

Test: Decrease pad_update_ns