Option: Auto-export makefile when saving a project

[takeshimiya]

Hi!
I think that there must be an option to constantly update the makefiles so each time you save a project the makefiles gets updated.

This will resolve the out-of-sync problem of the C::B makefile in CVS.

Putting an "Auto-export makefile when saving the project" checkbox in menu Project->Properties would be good.

And of course, have the option turned ON by default on CodeBlocks-xx.cbp