* all:

* all:
	- move all singletons (such as account mgr, conf, widget factory)
	  to ModestSingletons, and they are accessed through to
	  ModestRuntime. This removes the need for many classes to
	  keep the singletons in their *Private, and move around the
	  same ptrs to functions.

ModestRuntime keeps maintains these singletons, and also takes
	  care of the stuff that was previously in ModestDebug and
	  ModestInit, and some of the other initialization in modest-main,
	  which is significantly cleaned-up as well

pmo-trunk-r743