Add Borealis GUI for patch extraction on Switch.

Replace the console UI with a Borealis-based flow, bundle ROMFS assets and
borealis as a submodule, and apply small upstream patches at build time.
Self-delete runs after romfsExit on quit so the NRO can be removed like the
old console build.

.gitignore

@@ -1,4 +1,5 @@
 build/
+resources/shaders/
 *.nro
 *.nacp
 *.elf