Problems:
- Disables cross-compiling (alternative: keeps two hash implementations which
need to be synchronized with each other).
- Puts code-specific name literals into CMakeLists.txt.
- Workaround for lua’s absence of bidirectional pipe communication is rather
ugly.
Removes all kinds of problems with sorting, provides a ready-to-use function
list representation for genvimvim.lua, does not require specifying function name
twice (VimL function name (string) + f_ function name).
