Remove unused imports, merge ps2 and virtio to both use linux input

events and move parsing code to libxunil, and add mouse support again by
using them, remove unneeded graphics and console output code, merge
build files to a rust app builder, make framebuffer a driver and remove
the graphics folder, add shell as an app in VFS

assets/.gitignore

@@ -2,3 +2,4 @@ doomgeneric*
 init
 helloworld*
 badapple*
+shell*