#412 core file support

[Jack]

As a user I need to be able to load a core file and have CodeBlocks launch the selected debugger, and display - as a minimum - the call stack associated with the core file. Additionally, for ease of use, I would like to be able to specify a minimal set of "start-up" options to the debugger, especially:

1.) symbols files path
2.) sysroot path
3.) shared object path
4.) source path

As a user I would expect to be able to issue commands to the selected debugger in the normal way via codeblocks.

It would be especially nice to have codeblocks display the associated source files in the main editor window.