SB AWE support can be disabled at compile time to avoid bloating the binary, also optimized screen refresh to refresh only notes that actually changed (plays without lagging on my 8086 now)

git-svn-id: https://svn.code.sf.net/p/dosmid/code/trunk@153 850bf26b-01f9-4b63-b2ae-8b26f6eb5263
6 files changed