fix that cxJsonFromString() stores NULL instead of a "nothing" value in case of a fill error

fix that token_destroy() did not set token->allocated to false

fix memory leak in the json parser and add more tests for cxJsonFromString - relates to #777

add support for line continuation in the properties parser - resolves #457

add more tests for cxPropertiesLoad()

add note that cxPropertiesLoad() does not roll back the changes to the map on error

fix that cxPropertiesLoad() is not falling back to the default allocator when the allocator is NULL

fix return value of cxPropertiesLoad() for non-empty files that do not contain keys

add allocator support to cxPropertiesLoad() - resolves #776

add cxJsonFromString() - resolves #771

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