Change `Char` and `String` to use UTF-8.

[ta0kira]

Some trade-offs between native vs. library implementations.

• Native:

  • UTF-8 in Char-literals.
  • Requires C++ API for use with C++ extensions.

• Library:

  • No messy integration with the compiler.
  • No reasonable way to make use of it in C++ extensions, since it won't translate well to to the other primitive types.

[ta0kira]

I'll reopen this if it turns out to be problematic.