cmake:
- add test-app-utils
- rename test-link-module to test-link-module-app-utils
- add gtest-import-map
autotools:
- move gtest-import-map from TEST_PROGS to TESTS (autotools) so it shows up in the colored results list
It is split into
- /libgnucash (for the non-gui bits)
- /gnucash (for the gui)
- /common (misc source files used by both)
- /bindings (currently only holds python bindings)
This is the first step in restructuring the code. It will need much
more fine tuning later on.