CGenlock: Remove copy constructor and assignment operator.
Initialize members of the SubLang and SubPos structs.
Advanced option page: Ensure that value is within the range to avoid problems in case settings were corrupted.
Advanced option page: Set topmost for tooltip window.

This is workaround for
https://connect.microsoft.com/VisualStudio/feedback/details/272350

Fixes #4641
Advanced option page: Be more careful about current selected item.
MiniDump: Put dump message on top.

This was very annoying that this message box ended up below MPC-HC window
which obviously couldn't be moved after crash.
Update libdivide.
Add an advanced option to set minimum duration for remember position
feature and allow to disable it for audio files.

Fixes #353, #3393
Refs #2179
MainFrm: Show drive label in title bar when playing DVD from root
directory.

Fixes #2194