Minerals template added, some rewritten, comments added:

Minerals template added, some rewritten, comments added:
- New template base_mineral.xml added which can be used for custom minerals to
  fit into the Ship-Simu engine.
- A lot list tags in many templates rewritten. We now use -list as a tag suffix
  for any lists.
- A lot more comments added to make the XMLs more clear.
- Research depency removed from building because the technology is the physical
  representation of the research results... :)