Add the compile-time SDL major version option and propagate it through
interface targets. Route SDL includes through C99 compatibility headers
while keeping SDL2 as the desktop and Emscripten default.
The font module kept a global "currently selected font" set by
font_select() and implicitly used when drawing. Make it stateless by
introducing a FontSpec {type, weight, size} that font_render_text() /
font_draw_text() and gfx_drawString() take directly.
Make FontWeight a two-valued enum and normalize the 1-9 weight to it
in commandZB().
Removes font_select(), ags_setFont() and ags_setFontWithWeight().
This adds "Unicode mode", in which scenarios can be written in any
language. xsys35c 1.2.0 and later can produce Unicode scenarios.
- nact->encoding represents the current scenario encoding. The initial
value is SJIS, and ZU command changes it to UTF8.
- Use conversion macros that switch the behavior by the scenario
encoding. For example, toUTF8() calls sjis2utf() if the scenario
encoding is SJIS, and calls strdup() if it is UTF8.
- Fix various string processing functions to work with UTF8.
kichikuou