depthmapX 0.55 beta

Transferred from https://github.com/blackseamonster/depthmapX/releases/tag/v0.55beta

Dev beta release of depthmapX in progress - this version has some issues fixed but is functionally very similar to previous versions of depthmapX. See https://github.com/blackseamonster/depthmapX/wiki/Changelog for changes.
Install by downloading the appropriate zip file for your platform and unpacking to the local hard drive - they should contain everything you need to run the app.

Changes:

• Fixed some internal memory/runtime issues
• Import links from file
• Fixed crash on zoom-out issue
• command line app (depthmapXcli)
• restructured the code base to have more libraries that can be tested and reused
• added catch as unit test framework
• made simple mode option persistent
• fixed persistence of user options on Windows
• fixed mouse wheel zoom (center on mouse pointer, not center of the map)