Funcs dict

adresses #449 (closed)

• adds the option to choose a function by passing a dict key to the saqc methods, wherever possible
• the dictionary of available functions is retrieved now from saqc.parsing.environ variables
• adds validation for function selection to the checking library
• moves helper functions from the lib.ts_operators module to saqc.func modules to avoid circular import
• moves the literal checking from funcs.tools to lib.checking to avoid circular imports

added category: config category: public API usability labels

requested review from @schaefed

assigned to @luenensc

added 1 commit

• 4ee7b6f4 - bfx

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• 1aa6f530 - added WMO operators/minor bfx

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• 40341d2f - updated changelog

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I basically already gone for the next four weeks...So I reassign to @palmb

requested review from @palmb and removed review request for @schaefed

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• 3ec5a333 - Apply 1 suggestion(s) to 1 file(s)

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added 3 commits

• 2e71485c - reverted lit extraction shift / moved impro into function body
• aa76d2cb - added comment
• b80072a9 - black/isort

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