oox: add customshapes preset data

This is generated data, meant to replace
source/drawingml/customshapepresets*.cxx soon. Just like the code
before, let's have it in git, generating it requires an already working
Impress, so it's nontrivial to produce it build-time.

Change-Id: Iaf8c77fc6ee0402e3e145b131724b7891d6b6b3f