ObjFW  Tags and Properties

Tags and Properties for Check-in e2a53689c6

Context
2020-07-19
16:17
Merge trunk into branch "tagged-pointers" check-in: e2a53689c6 user: js tags: tagged-pointers
2020-06-29
19:42
runtime: Add helper functions for tagged pointers check-in: a964d3dcb4 user: js tags: tagged-pointers