Salieri: shader cache (#1701)

Here come Salieri, my implementation of a disk shader cache!

"I'm sure you know why I named it that."
"It doesn't really mean anything."

This implementation collects shaders at runtime and cache them to be later compiled when starting a game.

Ryujinx/Config.json

@@ -21,6 +21,7 @@
   "enable_discord_integration": true,
   "check_updates_on_start": true,
   "enable_vsync": true,
+  "enable_shader_cache": true,
   "enable_multicore_scheduling": true,
   "enable_ptc": false,
   "enable_fs_integrity_checks": true,