Uses the built in cmake -Dtest=ON

It should download googletest on the fly if needed.

Adds a new make target, `make test`

Ref #167

This is the first implementation of a theme manager. It’s a rebased and
revisited version of #792.

This is the first implementation of a theme manager. It’s a rebased and
revisited version of #792.

They are needed to fetch prices from deckbrew and possibly, in the
future, for ssl server connections

* Move all cmake-related files in a new “cmake” folder
* move nsis files in there, too, since they are templates parsed by cake
* retrieve git version once when cmake is run, and use it for both
creating version_string.h/cpp and for package naming

It's making travis complicated

Ref #127

This has been obsolete a long time

By now tested on OSX only