- It is not enough to have  and DeleteSymlinks actions
because within the same installation some exes executables can be both
added and removed, which needs both adding and removing some symlinks.

Instead of CreateSymlinks, there is now FixSymlinks function, which
goes through the list, and adds or removes the symlinks as needed.

- Implemented rollback for symlink custom action.

- Generate list of symlinks in C++ file, using CMake, rather than storing
lists as MSI properties.