- Added env var TINIA_3RDPARTY to location list for libs.
- Marked most tinia-variabels "advanced", in order to hide them, but left TINIA_INCLUDE_DIR as it efficiently shows the
  user where the headers are fetched from.  Also, I don't think the 3rd-party-loc will end up as "advanced", so that
  will show whether or not, and from where, pre-built and bundled packages will be fetched from.
- Refactored duplicated path lists into a single variable. Ordering of paths has changed slightly.
- Uncommented back in libtinia_javascript lib for Desktop mode.
- Standardized CMake names: Tinia_*_LIBRARY for each of model, modelxml, renderlist, renderlistgl, jobcontroller,
  ... etc., i.e., * spelled exactly like the corresponding part of the actual library filename. (Least radical change
  involved and easier to process lists of libraries and variables.)