Also adds in missing includes that are now required.

re #16129

re #16129

re #15736

re #15736

Applies the same hack that is done in the script editor to increase
the default zoom level by a few points to compensate for the higher
resolution.
Refs #13672

Also added min and max zoom rules to match those in QScintilla
re #9566

re #9566

re #9566

re #9566

minor change

re #5895

This is because if you set it read only then ctrl+c for copying does not work
this approach allows ctrl+c and disables user editing through the use of the KeyPress handler
and disabling drag and drop
also the mouseMoveEventHandler prevents dragging out of the control affecting the text.

re #5895

Also fix segfault on shutdown.

In addition the output from the tests is no longer captured by MantidPlot
to make for easier debugging and better error reports.