Enable RAVENMD4 by default (and remove extra test build)

Got idea from Marcus Collins.
Fix displaying demo name when loading demo
Merge remote-tracking branch 'ioquake3/master'
Add cgame traps to get demo state, position, and name from Tremulous
Add cgame trap to get length of playing demo

Allows demo pos / length to get percent.
Move demo recording message from client to cgame
Use vmCvar_t to access ui_recordSPDemo in cgame
Don't use ui_recordSPDemo to disable "already recording" message
Remove old x86_64 JIT compiler
Remove README note about USE_OLD_VM64
Merge remote-tracking branch 'ioquake3/master'

Conflicts:
	README
	code/qcommon/vm_x86_64.c
	code/qcommon/vm_x86_64_assembler.c
Merge remote-tracking branch 'spearmint/master'

Conflicts:
	README
	code/client/cl_scrn.c
Merge remote-tracking branch 'ebx/master'