Moved all the code to a plugin module
Removed superfluous icons from the toolbar
Added combo-box drop down menu options
Added dockable window support
Added icons to the starship style
Numerous UI layout tweaks
#rb lauren.barnes
#preflight 613126e44f2c7c000154ae65
#ROBOMERGE-SOURCE: CL 17408889 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v865-17346139)
[CL 17408910 by mark lintott in ue5-release-engine-test branch]
