[added] Property tax can now be collected on buildings

Change-Id: I36d19dd754860b3b42e60856fc16eae578618f7e
[Changed] slicing terminals now requires slicing 1 skill
[Fixed] skill required to jam a faction base's uplink terminal

Change-Id: I04104765295b3e52f63fc5c8ed0a73093e45314f
Merge "[Changed] slicing terminals now requires slicing 1 skill [Fixed] skill required to jam a faction base's uplink terminal" into unstable