Script property classes' names should match their ASL counterparts

I thought back then that it would be nice to find a more meaningful substitutes for arx script commands, but now I have to have an extra mental step in my head remembering both the ASL command and their ALG equivalents.

A few examples:

- `halo` is managed by `Glow`, should be `Halo`
- `setname` is managed by `Label`, should be `Name`