Enable the --disable-maintainer-mode option.
Change default font to "sans-serif".
Add Vim modeline.

This should be close to the existing indentation.
Fix crash on empty string.

Imported from Debian SDL_Pango patch: fillrect_crash.patch.

Issue #1.
Move matrix definitions to implementation.

Adapted from Debian SDL_Pango patch: matrix_declarations.patch

Issue #1.
Add common API additions.

This adds the following new functions:
- SDLPangoDraw_CreateContext_GivenFontDesc
- SDLPangoDraw_SetText_GivenAlignment

Adapted from Debian SDL_Pango patch: api_additions.patch

Issue #1.
Fix overflows when copying bitmap to SDL surface.

Adapted from Debian SDL_Pango patch: blit_overflow.patch

Issue #1.