two new functions splitKeyValuePairs and groupByMultiKeyValuePairs #319
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splitKeyValuePairs
allows splitting a string into a map of key value pairs, e.g.
key1:value1,key2:value2
into a map of key valuesit also allows providing a defaultKey, if not KeyValuePair splitting character is found the string is assumed as value and a defaultKey is set as key, otherwise value and key are same
groupByMultiKeyValuePairs
simialar to
groupByMulti
but interprets the splitted string into a key and value part and the grouping is done by the key