utils: Add gst_object_(g|s)et_(string|int|...) functions
@slomo
Submitted by Sebastian Dröge Link to original bug (#760705)
Description
It's easy to get the type of properties wrong in the varargs functions, especially for 64 bit integers. We could provide helper functions that are typed and for one specific property, and also do checks in there if the types are matching with the one of the property.