Minor update to the developer documentation [ci skip].
Upgraded QScintilla from version 2.7.2 to version 2.8.
Some minor improvements to our Info.plist template [ci skip].

I was hoping that setting NSHighResolutionCapable to true would make a
difference with regards to issue #249, but it doesn’t…
Some minor cleaning up [ci skip].
Fixed a memory leak.
Some minor cleaning up.
Slight improvement to the timing code (and not timing itself) of a simulation.
Some minor cleaning up.
Some minor cleaning up.
Improved the delay between two data points (closes #250).
Got our 'do nothing' loop to work properly when compiling with optimisations.
Our 'do nothing' loop function still got optimised by GCC, so explicitely asked for no optimisations on Linux.
New snapshots.
Improved the implementation of our Core::doNothing() method.
Don't actually need to set NSHighResolutionCapable to true (on OS X) since it's the default value [ci skip].
Minor cleaning up [ci skip].
Some minor cleaning up [ci skip].
Fixed the blurry text issue with QScintilla on Retina displays (closes #248).
Slight update to the user documentation [ci skip].
Some (initial) work on our PrettyCellMLView plugin (#17).