Fixed|Windows|qmake: VC solution generator script

There was a problem with the GUI Shell project settings.
Windows|Client|Default Style: Define a default font
Fixed|Client: Clearing the DED database

memset cannot be used because it contains a C++ member.
Fixed|Windows|libdeng2|libgui: Exported classes
Fixed|Info|ScriptedInfo: Minor glitches

Initialize element line number to zero, resolving variable names when
inside a namespace (and variable doesn't exist yet).