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.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "library/borealis"]
+	path = library/borealis
+	url = https://github.com/natinusala/borealis.git