MgResourcesLoadFailedException needs greater context

[jng]

The MgResourcesLoadFailedException message needs to have greater context. The message is usually of the form:

Failed to load Resources/mapguide_<locale>.res for locale '<locale>'

Which tells us nothing about why this exception was thrown. It could be:

• File not found
• Insufficent permission to access file
• Something else?

This exception is a critical one as it is mostly thrown during web tier initialization. And if web tier initialization doesn't complete, most of the remaining MapGuide API is un-usable. So it is very important that this exception (if thrown) contains as much useful information as possible to diagnose the problem at hand.

[jng]

Suggested test case to try triggering this:

1. Call MgInitializeWebTier for the first time with a bad path to webconfig.ini
2. Call MgInitializeWebTier this time with a good path to webconfig.ini

[jng]

Ticket retargeted after milestone closed

[jng]

Milestone renamed

[jng]

In 9601:

Apply patch to give better context for MgResourcesLoadFailedException

Fixes #2206