Plugins Plugin UI Undocker

• When undocked plugins are reloaded, they are automatically undocked and restored to their previous position.
  • Thanks to @CheesyFX for the suggestion.

• Fixed issue with session and scene plugins. It currently doesn't work for them, and now handles that gracefully.
  • Thanks to @lapiroman for flagging!

• Added an 'always show' toggle that'll allow the plugin ui to stay open when you de-select the atom.
• Should work properly with CUAs and other atoms now
• Fixed issue where plugin always attached to new atoms

• Fixed issue where some parts of the Timeline UI (and likely others) stopped receiving click events.
  • Thanks to @rlbrooksssg for flagging

Couldn't quite get 'always show' working, but hopefully soon!