Build structure

Closes #42 

Improved, new build structure:
All built libs go into /build/lib (or whatever_you_specified/lib)
All built executables go into /build/bin (or whatever_you_specified/bin)
All resources go in the /res folder in the repository root. This will be copied to the runtime directory (/build/bin).

The different configurations have different suffixes to be able to differ between them (for example '-d' for the Debug configuration).

The resource paths in Go_GUI module are adjusted to reflect these changes.