Hide toolbars when in the wrong perspective

[massimo ceraolo]

Now that OMEdit has many toolbuttons, the toolbar area has become crowded.
Currently when switching perspective, inactive toolbas are left in position and greyed. For instance Plot and Resimulate toolbars in the Modelling perspective.
IMO, much better would be if in each perspective only active toolbars are shown. This would allow a better space exploitation.
For instance I like running OMEdit in a window, so that I see other things of my desktop. Thus currently I need to keep toolbars in two rows, which consumes space. If inactive toolbars were automatically hid, I could easily leave in place just one toolbar row.

In addition to allow better space exploitation, hiding inactive toolbars would make the main OMEdit window's appearance cleaner, thus allowing faster finding of the correct button.

[Adeel Asghar]

Done in 7f0c9aa/OMEdit.