Revert "[[ CombiningChars ]] Fixes the IDE tokenization and deletion when combining chars or surrogate pairs are typed in the script editor"

This reverts commit 538447dfbcb01ccba658c8062e9b07ae612dff1c.

Conflicts:
	engine/src/block.cpp
[[ RefactorSyntax ]] Fixes array index increment on MCStringSplit
Merge branch 'refactor-syntax_unicode' of https://github.com/runrev/livecode into refactor-syntax_unicode
[[ TextChunkUtilities ]] chunk offset of empty string must use 'split' chunks codepath
Merge branch 'refactor-syntax_unicode' of https://github.com/runrev/livecode into refactor-syntax_unicode