Some tweaks to templates, and wip work over Objects part.
WIP support of object export: Camera data.
Add an helper for properties that takes an additional template, and checks if that prop is not already in the template with the same value.
Basic object support.

File loads without crashing under both Blender and Houdini, but position/orientation of cam in first one is not as expected, and in Houdini we get no camera at all...

Will leave cameras as is for now, and work on basic meshes support next.
Add some code to abstract array typecodes (their sizes are not guaranted, it may vary depending on underlying arch/C, not nice to save in a portable way!).
Basic mesh support (simplest geometry data), many fixes at object (Model) level, at UID level, etc. Seems to work fine with own importer, so far.