Redesigned Fungus Script window and inspector UI

Sequences are now shown as simple coloured nodes in Fungus Script
window.
Commands for the selected sequence are now shown in the full inspector
window.
FungusScript window now continues to display the most recently selected
script.
Fungus Script window now refreshes every frame.
Can zoom out further on Fungus Script window.
Fungus Script window and Sequence inspectors now have separate context
menus.