Improve security and configurability of functions that access the Environment and System Properties#4452

Draft

adamretter wants to merge 11 commits intoeXist-db:developfrom

evolvedbinary:feature/security/env-prop

Commits on Aug 3, 2022

[ignore] Reformat code
adamretter
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[ignore] Fix Typo
adamretter
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[bugfix] fn:available-environment-variables and fn:environment-variable should be deterministic within the execution scope
adamretter
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[bugfix] Make thread-safe
adamretter
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[refactor] Rename class to ExistSystemProperties to make it clear these are not Java System Properties
adamretter
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[refactor] Use constants for eXist-db System Properties
adamretter
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[bugfix] util:system-property should be deterministic within the execution scope
adamretter
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[feature] Add the function util:available-system-properties#0
adamretter
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[feature] Allow access to specific Environment Variables when using fn:available-environment-variables#0 and fn:environment-variable#1 to be configured from conf.xml
adamretter
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[feature] Allow access to specific Java System Properties when using fn:available-system-properties#0 and fn:system-property#1 to be configured from conf.xml
adamretter
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[bugfix] Adjust test for Windows
adamretter
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