* ecore_thread_run: Add a facility to run heavy code in another thread

	* ecore_thread_run: Add a facility to run heavy code in another thread
	that still integrate cleanly with the EFL.

	ecore_thread_run need two callbacks :

	* func_heavy is called from another thread and should not use the
	EFL except Eina, but carefully.

	* func_end is called when func_heavy is done, but from inside ecore
	main loop, so you can at this point call every EFL functions without
	fear.

	Note :

	The system automatically detect how many CPU you have and will spread
	the load on all of them.

	You must not assume that the result will come in the same order you
	requested it. Depend on each CPU load and how heavy the function on it
	are.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/ecore@41555 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33