Implementation of inferior PTY / IO needed

### Cannot distinguish program output from gdb mi output
`cdt-gdb-adapter` would try to interpret every line as gdb mi output, which causes a problem because it cannot distinguish program output from that. For example:
In the image above, `cdt-gdb-adapter` tried to parse the line that's started with `=` or `*`, and failed.

### Only parse the output after a line is finished
According to:
https://github.com/eclipse-cdt/cdt-gdb-adapter/blob/3b9442075d06759035dbae616dbbd9923b921bc6/src/MIParser.ts#L26
the MIParser only handle the output when a line is finished. In the case of program output, this can be really buggy.