v684 release.

'Enable24HzDWM' registry option added - default is '1' (enabled), uses normal DWM queued mode operation in 24 Hz display refresh situation.
'EnableDWMInitSleep' registry option added - default is '1' (enabled), adds small delay after DWM queued mode initialisation and reset to help with 24 Hz display refresh situation (mostly).

Small changes to logging code to make sure LogRotate() always works properly.