* Rewording some of the message sequence nodes
* Fix batch test for overlap renaming
* Finish msg-sequence node help rewording
* Rename maxKeptMsgsCount to nodeMessageBufferMaxLength
* Rename nodeMessageBufferMaxLength in tests
* Remove Join-merge mode for later rework
* initial support of merge mode of JOIN node
* initial support of reduce mode of JOIN node
* update info document of JOIN node
* add tests for merge & reduce mode of JOIN node
* tidy tabs & spaces
* add test for too many pending messages & related fixes
* add an test for reduce mode of JOIN node
* change order of modes of SWITCH node
* add initial topics entry of merge mode
* fixed descriptions on "reduce right" checkbox
* fixed update of typedInput field of reduce mode
* fixed a typo in info document of JOIN node
* allow empty string in JSONata input field of reduce mode
* fixed a typo
* fixed error in reduce mode description