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.
- strVar is now allocated as a vector of indefinite length buffers
rather than a single contiguous buffer.
- Strings can be any length, but truncated to (strvar_len * 2) bytes
when saved to a file, for backward compatibility.
- Now string commands treat 1-byte characters in the same way as System
3.9. This potentially fixes bugs in English translated games.
Implement the patched version of the MP command, which appends a number
of spaces to a string rather than truncating. This is only used in the
English translations of Rance III and Rance IV.
kichikuou