Remove scale2x and aspect ratio correction from SDL driver

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Remove cvsignore file

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Remove PalmOS, Dreamcast, and multiple palettes

Stick with the Amiga-ish palette and remove EGA and CGA options. Also
remove remaining PalmOS and Dreamcast-specific code.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Add xbrz scaler

This patch adds and builds the scaler, but doesn't call it in the code.
The idea is to use the scaler in the 320x168 AGI image before adding
text so fonts won't look strange.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Remove MPW-specific code

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>