Some work on supporting CLI features (#199). Also some minor cleaning up.
Got rid of the type of a plugin (General, Gui or Console).

Indeed, a plugin might want to offer both CLI and GUI features.
Minor improvement to our plugins window.
Some minor cleaning up.
Some minor cleaning up.
Slight update to our third-party libraries page.
Temporarily disable the preferences action (since we are not going to work on it just yet).
Improved the switching of file tabs.
Some work on the CLI version of OpenCOR (#199).
Updated the user documentation to provide some information about the features of the plotting area (closes #200).
Some minor cleaning up for building LLVM on Linux.
Cleaned up the Windows CLI version of OpenCOR
Some minor cleaning up.
Some minor cleaning up.
Slight update to our LLVM binaries (since we slightly modified our core plugin interface).
Some minor cleaning up.
Some minor cleaning up.
Updated the user documentation (as a result of #201).
Some minor cleaning up.
Addressed a small issue with Windows not handling threads very efficiently.

The issue was that a remaining call to
SingleCellViewWidget::simulationRunning() would be made after the
simulation has finished, thus making the plot non-interactive. So, now,
we set the interactive mode based on the actual state of the simulation.