SlyEdit: Support for entering UTF-8/Unicode characters; using K_CP437 to have Synchronet convert to CP437 internally

See merge request !397

SlyEdit: Support for entering UTF-8/Unicode characters; using K_CP437 to have Synchronet convert to CP437 internally

We don't want CI to die because someone somewhere upgrade a compiler.

NOTE: CI does release builds, which means that -Wall is not enabled.
      WALL=1 could be added if we want that, but it's likely too
      soon to take that step.

pointer to an element.  No way gcc has a clue about what I'm doing
then.

Maybe I'll figure out how to fix it later.

Both long long and long are reasonable for some mixes of platforms.

Just punt, cast the whole thing to int64_t, and forget about it.