Further trimming mostly for WiPy
Some trimming for WiPy and some changes for the other versions
- Making rarely used small functions inline again, which saves some space. Important for WiPy.
- Catch Ctrl-C on WiPy. Not really nice yet, since the next input byte is lost.
- Tab Size can be set with the Ctrl-A command (if available).
- Simplified Linux main(). No calling options any more.
- Always ask when leaving w/o saving after the content was changed.