Refactor IPC buffer descriptor interface

Fix fps counter to correctly measure frame end when there was no frame to draw

debugger: Fix wait_tree crash.

core: Silence formatting specifier warnings

maxwell_3d: Make constructor explicit

GPU: Partially implemented the QUERY_* registers in the Maxwell3D engine.

* audren_u: Schedule reoccuring event.

* audren_u: Stub GetAudioRenderersProcessMasterVolume, and misc. changes.

VI cleanup and add a hack for booting games

Service/lm: add support to multiline logs