Version 1.4: Eye tracking

Implements:

• Inter-pupillary distance in the generic data-export;
• Export of eye-tracking data using SRanipal (see Exporting eye-tracking data);
• File browser instead of an absolute path input field for every path input in the application;
• Warning modal window when an export file is about to be overriden.

Fixes:

• View mask staying active when we stop an experiment during a break;
• Possible path problems with trailing /symbols in the end of pathes. Everything is now uniformized using the class Pathof System.IO;
• Lots of unconventionally names properties.