[Qt-creator] ability to configure the debugger

[dAgeCKo]

Hello,

under Linux, when using libtool for making libraries, we must use 
libtool to start the debugger. The other solution is to install the 
project (threw make install) and then debug from here. But this is too 
complicated to do that each time.

Unfortunately, qt creator does not provide any way to change how to 
start the debugger.

So I'm hoping this could be an interresting feature for a next release.