update toolbar16 to v2.0

update Toolbar 16 v2.0: add preferences window

• the script now works correctly with 3D viewer
• you can save preferences for stay on top of all windows and optional remember last position
• flush button resets position data
• little triangle button on the right toggles preferences dialogue
• added check if main UI is already launched to prevent multiple windows

update Saver tools v1.3: add convert to Saver plus tool script