WIP: [th/libnm-properties-override]

Closed Thomas Haller requested to merge th/libnm-properties-override into master

Refactor libnm's handling for the property meta-data.

Move the common parts of NMSettInfoProperty to a NMSettInfoPropertType. This saves some 13K at runtime. Also, it makes more sense to split the property-info in per-property information (e.g. the "name") and the property-type (with the function pointers for the behaviour).

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