SCANMSG only supports a modules own MSG files, not *ANY* MSG File

[enusbaum]

Documentation from Dev Guide:

Our current implementation only supports the MSG files defined in the module MDF file.

The scanmsg implementation needs to be updated to:

• Search the current module path for an MCV file of the same name
• If not, create a new MsgFile object, and compile a new McvFile
• From the McvFile object, load the specified value

Because MBBSEmu modules can exist in their own folders/paths, we'll need logging if a specified MSG file isn't found, since the end user will need to ensure that the dependent modules are loaded with one another.