Install things where MSVC and MinGW expect them

Install things where MSVC and MinGW expect them

- dlls go into bin
- debugging symbols (pdb files generated during debug builds) MUST be install (also into bin)
- only the import library and the static library end up in lib
- MSVC only: 64 bit build MUST go into amd64 sub-folders of both the bin and lib folder

Debugging information are now directly embedded into the static library (/Z7). This should make the it much more self-contained.