Fix crash in case of :endif without :if in topmost level
Add errors testing
Fix E128: it should work like how it describes it works
Update expr-main.c
Fix handling of single-quote strings with single quote at the start
Fix expression node_dump: it used wrong index to case_compare_strategy_string
Fix `abc.def is# 123` expression handling (is# was not recognized)
Allow echo 1|echo 2, allow empty return
Fix unlockvar handling
Fix position of space

It should be after case_compare_strategy_string, not before