Review changes made for Issue #53 CMake

I've made all the CMakeList files the project needs. I managed to get the project to build, compile and install. However, when I try to run the qmlscene ui/main.qml, it can't seem to find the directories where the plugins are installed. Could you have a look?
I tired all kinds of launch commands, includes, libraries links, etc to get that QML file to load the plugin, but, ouldn't figure it out. Some of the lines in the CMakeLists are left overs from that process. I can clean those out, if they aren't really doing anything, or I'll comment them, and you can look at it too.

This whole CLICK_MODE thing is copied from the core-apps projects