Added actions for envelope height

 - SWS/wol: Get/Apply height of/to selected envelope
 - SWS/wol: Save/Restore selected envelope height
You have multiple problems with these 2 actions:
SWS/wol: Save/Restore selected envelope height

1. User can't remove saved envelopes
2. User can't known which envelopes are currently saved without running the action and changing current heights
3. Heights are not preserved through REAPER restarts
4. Action names don't really reveal what actions do exactly

Overall, it looks too complicated.
I recommend you scratch these two and leave the other two ( which would benefit if turned into slot actions...slots in this case should IMHO be saved globally, not per-project - the same way S&M actions save CC lanes for example)