Unit Tests are now part of main build

- debug builds always compile unit tests in
- seperate qgcunittest.pro is no longer needed
- found out the hard way that you can’t use debug or release as a
scope. You need to use the CONFIG(debug,debug|relase) macro (in this
example to test fro debug). Reason is that debug and release show up
multiple times in CONFIG, last debug wins. This is what the CONFIG
macro does. Without it, it’s luck as to what you get. I found OSX was
getting debug, Linux was getting a debug build, build into release
directories. QT_DEBUG set randomly. Lot’s of problems.