Fix backward framestep recovering wrong file position.

Fixes #4782
PPagePlayback: Fine tune layout.

Ref: #4766
Check return value.

This commit suppress some Coverity issues.
Adjust width of the groupbox headers to avoid empty space.

Fixes #4758
Fix detection of monitors connected to secondary GPU.

EnumDisplayDevices is failing so we make detection of device name
optional.

Fixes #4752
Rename "JPEG quality" to "JPEG Image" to not duplicate "quality" string.

Fixes #4788