MangoHud

Bumped layer api version to 1.3.0
This fixes MangoHud not loading with latest DXVK
Bumped meson to 0.60
Only install data files if include_doc option is set
Allow use of system nlohmann_json dependency
Added metainfo file
Fixed table_columns not working as expected
Minor adjustments to hud elements and imgui
Convert from printf's to SPDLOG
Added MANGOHUD_LOG_LEVEL env variable
it takes off, info, err, warn
Added StarCitizen_Launcher.exe and InsurgencyEAC.exe to blacklist
Added FCAT support
Disabled gamepad_battery_icon by default
Generalize control over socket so it works with OpenGL as well
AMDGPU: fixed gfx and cpu power metrics being parsed incorrectly
fps_only disables legacy_layout by default

MangoApp

Added man page
Install MangoApp layer to libdir_mangohud
Prevent resizing of the MangoApp window when using fps_only.
This prevents the hud from flickering when number of digits increase or decrease
Fixed issues caused by us not releasing the XAtom.
Namely preventing other apps from using the gamescope overlay and sometimes causing a black box to be drawn
Disabled vulkan layer
It was not working properly so we disabled it until fixed as to not cause confusion.