Qt: Update to Qt 5.15.2

main: Don't add an extra separator when the title version is absent

network: Do not log IP address

Required by Qt 5.15's QtWebEngine

input_common: Add alternative string for joycons

core: Properly shutdown and exit the running application when ISelfController::Exit is called

This also moves the call to the end to ensure services are properly destructed on exit.

This allows ISelfController::Exit to stop the currently running application. This is typically used by homebrew to exit back to the homebrew menu after calling consoleExit with libnx.

Logging this may be a privacy concern for some users.

Remove Boxcat BCAT backend

ci: Use latest ubuntu image for mainline/patreon step 1

applets: Use subdirectory of main data directory for QtWebEngine storage

Some titles, such as homebrew, do not have any version string. Because
yuzu hard codes the title bar string assuming a version string is
preset, booting homebrew causes yuzu to add an extra separator with no
content between.

This uses a lambda expression to prevent that from happening.

buffer_cache, maxwell_dma: Minor refactoring and code fixes

style: Remove extra space preceding the :: operator

gl_texture_cache: Unify BGR copy passes using PBOs

Fixed invalid iterator usage

The current implementation of BoxCat as it stands is non-functional due to the reliance on a server providing BCAT files.
This implementation will eventually be replaced with one that allows the use of local BCAT files dumped from a Nintendo Switch.

audin_u: stub Start, RegisterBufferEvent, AppendAudioInBufferAuto

Hide XInput bypass on non-Windows OSes

vk_texture_cache: Disable cube compatibility flag on non-mesa AMD GCN4 and earlier

Update function tables to FW 13.0.0