organize source files in GPSBabel.pro, CMakeLists.text` (#787)

organize source files in GPSBabel.pro, CMakeLists.text` (#787)

* organize files in GPSBabel.pro and CMakeLists.tst

This makes it easier to compare the two, and easier to see what
changed when nuking things.

* fix for lack of continuation line

* update nuke_format for sources on their own lines.

delete MSVC project and solution files.  The project files should
be generated with "qmake -tp vc GPSBabel.pro".  MSVC will create
the solution file if needed.