Fix some issues with saving playback position.

Fix lagging framestep with madvr

Optimize timer coder that is used for hiding mouse pointer and toolba…

…rs. Use lower timer resolution. Set timer for hiding toolbars only when a delay is applied, because UpdateToolbarsVisibility() is already called when moving the mouse, so no timer is needed in that situation.

Small LAV update

Replace DebugBreak with ASSERT