Add missing FBSD building steps & fix its deps

Even though the windlight file names containing %20 & %21 isn't liked by
either CPack or FBSD packaging problem will eventually have to be
solved, the hack steps are small that they should just be documented,
in case (more) others would like to build the FBSD package.
Use custom PYTHON environment setting instead of relying on creating
links named python and/or python 3 to the system Python executable.
Reorder build requirements, add missing dependencies that can be set to
automatically installed. The absences of some were leftovers from
dependency on system ColladaDOM and GTK2 (or my failure to add some
package names to the CPack dependencies, caused by the gtk2 vs. gtk20,
apr vs. apr1, sdl2 vs. sdl20, etc. FBSD package/port naming confusion).

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