Replace ascii-math based construction menu hotkeys with an explicit list.
Only highlight constructions when the player can build them.
Random line wrap fix.
Move construction internals into .cpp file.
Re-add dependency on crafting.h from construction.h.
Fix dumb error where enter would always be ignored
Merge branch 'fix-construction-menu' of https://github.com/kevingranade/Cataclysm-DDA into kevingranade-fix-construction-menu