Events are supposed to be cleared on quering. This fixes that issue.

This has been hardware tested and it seems that NVFlinger will still 
signal even if there are no buffers to present.

This commit uses guest fences on vSync event instead of an articial fake 
fence we had.
It also corrects to keep signaling display events while loading the game 
as the OS is suppose to send buffers to vSync during that time.

SDL: Fix missing header

This fixes linux and mingw builds.

Port citra-emu/citra#4950: "Add FPS to SDL title bar"

[crypto] Use IsAllZeroArray helper function

externals: Track mainline zlib as a submodule

Likewise, we also only want to link in the libraries that we actually
make use of (so we don't need to worry about linking in test targets).

We don't need to depend on a custom fork for this. We can add the
library as is, and then make it excluded from the ALL target, so we only
link in the libraries that we actually make use of.

Port citra-emu/citra#4004: "qt_themes: add two colorful themes"

bcat: Implement BCAT service and connect to yuzu Boxcat server

ci: Add windows MSVC builds to patreon and mainline pipelines

ci: Iterate through GitHub pages for pull requests

Signal styleset changes at a better time

Remove AppVeyor status from the readme.md

ci: Merge patreon tagged PRs from public repository during merge step.

Ports BCAT to use FSC interface

Huge thanks to lioncash for re-ing this for me.