New features
* Implement z-scaling factor to compensate for refractive index mismatch (issue 1).
* Add context menu actions to export any plot as a `.png` image and at a user-defined DPI (issue 3).
* Add global reset button to the main-window wizard and remove the one from the Analyzer.
* Add quick help for all entries in the Options dialog.
* Add links to code repository, issues page, and mailing list to the Help menu.
* Add a few minor UI tweaks.
Fixes
* Fix issue with applying a filter in the Time Inspector not updating the Analyzer plots.
* Fix issue with measurement lines being allowed when the plotted data was not spatial (x, y), and the reported distance would be in nm.
* Fix inconsistency in the way fluorophore IDs and colors were assigned by the various methods used.