Let Neo2 use its eight level types with level5 lock

Involves uncommenting level5-locking-types, making neo use them and changing level5 modifiers to locking ones.
This has also other benefits as e.g. Shift + Mod4 text selection.

As we have a limit on types, see https://bugs.freedesktop.org/show_bug.cgi?id=27988
we need to comment out two other types in place of the level5-locking
ones.