photophase: fix memory leaks

* Fix memory leak caused by unreleased of framebuffers new refs
* pre-cache Roboto typeface
* trace allocations/deallocations GL's resources

Change-Id: Ib1ca22aae7ba90c4282f91dcef69a5fe274017a8
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>