Fix a slight leak in LogManager.

m_debuggerLog wasn't ever deleted in the destructor.
Readded the tracking of the FIFO Writes.

Fixes issue 6165.
OGL: enable buffersubdata in detection
Rounded the loop addresses to the nearest 16bit value in the loop comparison.

Fixes issue 6160.
Removed some redundant code introduced in the last commit.
Small Blending logic fix for opengl backend
buildfix for my last commit on Mac OSX
Clean up blending code a bit.
Recommend Direct3D 11 or OpenGL instead of Direct3D 9.
VideoSoftware: Fail less at clamping.
Implement dual source blending to avoid unneeded alpha pass.
this implementation does not work in windows xp (sorry no support for dual source blending there).
this should improve speed on older hardware or in newer hardware using super sampling.
disable partial fix for 4x supersampling as I'm interested in knowing the original issue with the implementation to fix it correctly.
remove the deprecation label from the plugin while I'm working on it.