Consistent licensing

Add .gitignore

Add new compiliation units from libretro-common

Build with link-time-optimization

Remove hardware rendering

Remove hardware rendering support until an EGL library is available
through Nix.

Check RETRO_API_VERSION at component construction

Dhall: represent variables as a map

Add missing Nitpicker To_front command

Not sending "To_front" works with "wm" but not the "nitpicker" server.

Dhall configuration draft

Use new external Tup rules

Tup refactor

Track nitpicker view offset

Log hardware rendering initialization

Always allocate a framebuffer during update_mode

Common dir has moved

Fix keyboard polling for NXengine

Convert README to markdown, fix Tupfile

Remove a few global pointers

Tup update

Initialize audio sessions only if core requests them

Do not construct Audio_out sessions if the core audio sample rate is set
to 0.0.