* many bugfixes for js
fixes#12672, fixes#14153, closes#14123, closes#11331, fixes#11783, fixes#13966, fixes#14087, fixes#14117, closes#12256.
mostly fixes the fact that it was allowed to assign to newly created temp variables. additionally attempts to get rid of null initialized seqs/strings (though they might pop up here and there); this simplifies a lot of things and makes code size smaller. even if null seqs/strings pop up here and there it's still better than all those bugs existing.
* formatting fixes
* CI fixes
* more CI fixes
* Add a test for issue #9389
* Fixes#9389.
* Make object contructors copy objects properly by checking whether the expressions passed to them don't need to be copied.
* Make mArrToSeq implementation actually check if a copy needs to be made.
* Avoid unnecessary copy in mChr impl
* Assume set constructor elements need no copy
* Add a test for issue #9410
* Add a test
* fix passing fat pointers (#9410)
* Enhance tests
* More tests and fixes
* Add more (failing) tests [ci skip]
* Added equality operator for fat pointers, more tests and fixes
* Fix printing uninitialized strings
* Fix mInc, mDec double eval, add more tests
* Tests
* Refactored, fixed multiple evals, revamped the tests, added missing ops
* Fix ups
* Fix#9643 and #9644
* add pointer normalization
