Codechange: allow certain enumeration to be added

Otherwise C++20 doesn't like it.

Cleanup: Remove obsolete (Make)EnumPropsT. (#10697)

This was used by the command system to help extract p1/p2 parameters, which no longer happens.

Fix: commands with Axis in their arguments were not validated properly (#9943)

When you don't type an Enum, it is a signed value. To validate
if an Axis is valid, it is checked to be lower than AXIS_END. Which
is the case for any value below 0.