Improvements to Trace Functionality and Fixes to some Buttons

The Buttons in the miscellaneous window (Add/Remove Robot, Hide/Show OBBs, Enabled/Disable Trace) now work again.

The trace functionality is also now also linked to the state of the glue gun and wielder I/O register states. So, if the either end effector is active and the state of its register is ON, then the trace will be enabled. However, the active state of the trace button has priority, so if the trace button is active, then the trace will always be active, even if the state of the active end effector is OFF.