Visual Test Shell for BACnet SVN

ReadTextPICS: make filename const

Device tree: sort object-type and property-ID controls, simplify numeric type and property entry

Corrected "multistate-xxx" to "multi-state-xxx" matching the actual syntax.

Fix two uses of the ParseType "pos" instead of the proper variablenames

Accidentally deleted filling ErrorClass combo during enumeration updates

Add sorting to VTSEnumeratedCtrl, mostly for property-identifiers and object-types.
Refit various SendXXX dialogs to use the sorted lists.
Various C++ style cleanup.

Add a Format parameter to BACnetEncodeable::Encode( CString &enc ) to handle
- plain text, as in Edit controls
- EPICS format, as for property value display
- script format, wrapping Date, Time, Bitstring etc. with
Regularize BACnetXXXX class definitions to show virtual methods overridden and not.
Update client code to provide the Format parameter.

Widen date fields in dialogs: "Wednesday, 24-September-2014" takes a lot of room.

Fix bug that caused PageDown/PageUp in packet list view to move TWO pages.

Fix bug that caused crash if script was re-compiled after selecting a section or test.
Added validation checks to ScriptBase, and getter/setter to ScriptDocument for selected section and test.