KDevProject: explicit 'build' method

[Vladimir Prus]

Hi,
in neither KDevelop 3.4 branch, nor trunk, the KDevProject has no method to 
explicitly build a project, and I think such a method is needed. 
Specifically, I'm trying to make the debugger automatically rebuild the 
project when some files were modified, so I need a method to build a project.

Right now, I connect to the 'slotBuild' that all concerete project manages 
seem to have, but it's very hacky. Any change an explicit method will be 
added in trunk?

- Volodya