closes constsstr branch constsstr

merges constsstr branch

Version 1.1 (library version 2:0:1).

fixes typo in v1.1

adds documentation for ucx_szmul and 32 bit support

comprehensive code example for the memory pool

documentation for the UcxStack

completes conversion to scstr constsstr

adjusts code sample for UcxMap

adds a code sample for UcxMap

(0) -300 -100 -10 +10 +100 tip