Support multiple videos playing

Fixed #7502

shader_recompiler/backend: Minor organization and refactoring to reduce compile time overhead

(README) changed the color of Discord badge to use the new color 

CMakeLists: Specify /Zm200 when compiling in MSVC

This increases the memory heap size for constructing precompiled headers to 2x the default.

input_common: Update SDL to 2.0.18

service/hid: Stub SetNpadCaptureButtonAssignment and ClearNpadCaptureButtonAssignment

Used by ring fit adventure 1.2.0

Add support for subsdk8 and subsdk9

emit_spirv.h is included in video_core, which was propagating further includes that video_core did not depend on.

general: Add missing copyright notices

core/hid: Add missing controller type

native_clock: Wait for less time in EstimateRDTSCFrequency

core/hid: Ensure only valid npad are connected

video_core/codecs: more robust ffmpeg hwdecoder selection logic

In my testing, waiting for 200ms provided the same level of precision as the previous implementation when estimating the RDTSC frequency.
This significantly improves the yuzu executable launch times since we reduced the wait time from 3 seconds to 200 milliseconds.

general: Replace high_resolution_clock with steady_clock

... to fix build on Flatpak (and self-builds)

* skip impersonated VAAPI implementaions ("imposter detection")
* place VAAPI priority below CUDA/NVDEC/CUVID

service: am: ISelfController: Stub SaveCurrentScreenshot

- Used by Disney Magical World 2: Enchanted Edition

yuzu: Implement basic controller UI navigation

On some OSes, high_resolution_clock is an alias to system_clock and is not monotonic in nature. Replace this with steady_clock.