Cromwell sets these registers on video initialization and
guest OS should be able to read them in order to obtain
current screen resolution set up by firmware.
This patch does the following:
- Fixes up things for Qemu 2.x compat
- Factors out the high-level NV2A blocks into separate files
- Updates g-lru-cache for latest glib compat (github.com/chergert/glrucache@c10af24)
- Changes texture hashing algorithm from FNV to xxH v0.6.5