Change line endings to Unix.
Add ST2's original exec.py.
Update to ST3's exec.py.
Fix to work on ST2.
Add helper process to kill like shell ctrl-c behaviour. (WIP)
Revert "Add helper process to kill like shell ctrl-c behaviour. (WIP)"

This reverts commit 3503327da3b1036950c70e9213a8d9d3482c908e.
Kill process using ctrl-c.
Fix for linux (cannot import ctypes on linux).
Fix for linux.