- Solves the bug where the sector would stop being scaled by dragging a
corner and the bug where the sector's bounding box and real position
would sometimes stop corresponding to one another by changing strict
equalities of potentially very small numbers to checking their absolute
differences is less than a certain threshold.

- Manages negative values for field input, especially for angles

On the mask tab of the instrument view, when the user inputs a value in
one the field, the view is now updated on validation of this value (i.e.
when the user clicks outside the field or hits Enter), whereas before,
the user needed to hover over the instrument view to see the changes
take effect, which was illogical.

Also, when there is a correction on the value entered (for example a
negative value for a positive-only field), the value corrected is
immediatly showed, instead of waiting for the user to deselect-reselect
the shape.

- Add a proper shortcut
- Fix the bounding box not following the sector when moved, but updating
it
- Set new endAngle at creation
- Fix a bug where the topLeft corner drag was mismanaged due to a bad
variable
- Better check for angles and radii values

Refactor redondant parts of the code and modify some default values to
be more convenient for the user.

Make it so it is possible to draw sectors in the pick tab too.

Speed up function template browsers in indirect analysis GUI

Fix crash when switching backgrounds in ConvFit tab of indirect GUI

Update MSlice version in Mantid

Add Ubuntu 20.04 build dependencies list

This commit removes unnecessary replot calls, which slows the interface down. It does this throguh a RAII structure, which controls when redrawing occurs in the main plotting command.

Add output options to ConvFit

MantidPython and Notebook remove and add Docs

Fix typo in install rename command

Abins: remove unnecessary check on parameters dict when testing data loaders

Fix CTRQ performance test regression

Fix workbench launchscripts for windows package

Improve Performance of Loading Python Plugins During Startup

I'm not sure why this worked before but after a recent change to move this algorithm from MDAlgorithms to the Reflectometry directory, problems were showing up with the framework not being initialised and there seems to also be a problem with loading a workspace group via a managed algorithm.

Muon double pulse analysis

Mantid workbench won't load without some of the algorithms in the
manifest, but it still has to be possible to import the simple api
without the python algorithms.

RE #28822