Speed up / fix operator selector and editor for BT sequencer #1
Description
Currently there are two things that are incredibly slow when working with the operator selector
and operator editor (https://github.com/damagefilter/PlayblackCore/blob/master/Editor/Sequencer/OperatorSelector.cs#L51 and https://github.com/damagefilter/PlayblackCore/blob/master/Editor/Sequencer/OperatorEditorWindow.cs#L42 respectively)
The first scans the whole assembly (and external loaded assemblies) for ModelTask types with certain attributes on them. It does that every time the window is first instantiated. That is slow. Very slow.
Needs speeding up.
The second is slow because it stores the whole scene on close which was/is a work around for the fact that
unity doesn't properly serialize and store the BT data if it changed and I can't figure out why.
It needs fixing anyway.