Wait idle fix#2

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AlejandroCosin wants to merge 11 commits intogary-sweet:masterfrom

AlejandroCosin:wait_idle_fix

Commits on May 5, 2020

Adding Vulkan-style statistics counters where available
gary-sweet
committed

Commits on May 6, 2020

Commits on May 13, 2020

Commits on May 18, 2020

Tweak to Broadcom specific counters
gary-sweet
committed

Commits on May 19, 2020

Commits on May 26, 2020

Tidy up some formatting and rename some methods
gary-sweet
committed

Commits on Jun 11, 2020

Fix Wait Idle sample: render_context is reset in WaitIdle::prepare and then used some lines below in the call to stats->request_stats
AlejandroCosin
committed