stanzacmp tests: Fix some [luacheck] warnings

stanzacmp+tests: Add support for scansion:strict to allow override of default behaviour

spec/stanzacmp: Allow passing XML strings to yes()/no() to avoid manual stanza building

scansion.xml: Add 'scansion' namespace, and tests

Remove testcmp.lua (replaced by spec/ for busted)

tests: Add test for scansion:any

Add Dockerfile

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mercurial