Add a class to abstract out the BuildSystem from the Project.
Thie idea is to make a Project have-a BuildSystem, so that
it can stop being one.
The Projects in the different ProjectManagers will get much
simpler that way (and many will only consist of a constructor
with some setter calls) and handles all the interactions
between the rest of Qt Creator and the project.
The complex code to interact with the build systems is then
separate from that.
Change-Id: I3bbb000bb1aed91f0b547ac493f743ede8afb8cd
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Introduce BuildSystem to implement functionality common to all
build systems out there. This includes things like delaying the
parsing by 1s.
The actual CMake specific code is then moved into a derived
class CMakeBuildSystem.
Change-Id: I84f4344430f19a44e16534db294382c436169ed5
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
