Simplified window configuration view.
Removed unneeded function; also some minor comment improvmenets.
Windows are no longer hardcoded. Winconf files now contain a draw function identifier.
Repaired erroneous previous commit and added check for validity of draw function identifier read from win config file.
Improved error message precision in init_winconf_from_file().
Silently ignore characters in config/windows/toggle_order to which no window exists.
All members of structs Win and WinMeta are now officially visible externally, removed "_" prefixes.
Corrected comment spellings and line lengths in code.
Fixed memory handling bug.
Added anti-hardcoding todo.