Refactor freecad.rb for FreeCAD 0.16+, Travis-CI and FreeCAD-ports-cache

[bblacey]

Some of the changes necessary:

• Now hosted on github (not sourceforge), so url resource needs to be updated accordingly
• 0.16 has since been released
• Opencascade 7 is preferred over OCE (OCE is languishing and is somewhat obviated by OCCT 7)
• FreeCAD is supported on Mavericks and later
• Formula logic can be simplified because CMake configs are more sophisticated (i.e. better dependency location)
• New dependencies (vtk, nglib, med-file)
• Tailored bottles
• New cmake build defines

[bblacey]

This formula is still in work but the following configurations have been tested and this formula is now used by Travis CI to install all FreeCAD dependencies for each continuous integration build.

Install FreeCAD dependencies brew install --only-dependencies FreeCAD/freecad/freecad

Install FreeCAD dependencies using pre-built FreeCAD-specific bottles to reduce install time brew install --only-dependencies FreeCAD/freecad/freecad --with-freecad-bottles

Install FreeCAD 0.17 head brew install FreeCAD/freecad/freecad -HEAD

Install FreeCAD 0.17_pre brew install FreeCAD/freecad/freecad

Still need to add ability to package as an Application but I see this mainly for installing FreeCAD dependencies and most non-developers should simply use the CI builds available in the Releases section of the FreeCAD/FreeCAD Github repo.

[ianrrees]

Safe to say this is now done?

[bblacey]

Yes. Thanks :)