GitLab

* Inlined gRPC methods to implement GetDebugConfig and IsDebugSupported

* Inlined function

* Renamed vars for clarity

* Added Debug gRPC adapter function

* Moved function and removed useless file

* Forward os.interrupt (aka CTRL-C) signal to the gdb process

This a challenging problem because we must wait on both an io.Read(...)
and a channel-read but, unfortunately, go native select can wait only on
channels.
To overcome this limitation I had to resort to a conditional variable and
write some boilerplate code to make everything synchronized.