Fix crash caused by batch ending too early.

Update TODO with bug.

Further tweaks to limit performance impact of timing calculation.

Streamline performance of debug code. Use raw floats for draw times and avoid resorting so many times. Seems to reduce time by about a third. Still ends up slow after leaving the game running for a few minutes.

Add more timers. Added Stopwatch for both misc UI and debug info.

Improve logging. ?Add logging for World.Draw (renderers) ?Keeping logging display from jumping around.

Add button to menu.

Drop a problematic reference from core csproj.

Tweak restore and solution file. * Run restore on the entire solution file. * Remove the ImGui project from the solution file to restore it to a previous version that seemed to work.

Fix core builds. Remove possibly unnecessary dependency that seemed to be causing issues.