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Added support for Delete key and Home/End keys
Tested on Ubuntu
Delete key is weird as it is specified by set of 4 runes (instead of 3 as with Home, End, or Ctrl + Anything combo). The seqence is 27 91 51 126
So workaround was made (in terminal.go) for this case, it checks whether Delete command was used (Ctrl + D or Delete key both returns CharDelete) and if so then it checks if next rune in buf is 126 if not it will put it back on top of the stack.