python-pycollada: new package

pycollada is a python library for reading and writing collada documents.

collada is an open file format (XML based) for 3D applications. Filename
extension is .dae (digital asset exchange).
freecad: add matplotlib and pycollada dependencies

When FreeCAD is started it prints that it's missing matplotlib and
pycollada:

  $ FreeCAD
  [...]
  matplotlib not found, Plot module will be disabled
  pycollada not found, collada support will be disabled.

The closure size of freecad is currently at 1.9 GiB. Adding these two
deps increase it to 2.0 GiB.

Reflow the expression function argument list.