merges constsstr branch

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

fixes typo in modules.md 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

documentation for the testing framework

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

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