Support for project types with no platforms.

[richardstanton]

Fixes #103

This includes several related updates:

• Fixes bugs with projects that do not support or require platforms in their configuration. (e.g. .rptproj) and adds tests.
• Add a shortcut to ProjectType definitions to specify SupportPlatforms="false" to make it easier to define projects that do not support platforms.
• Add rptproj ProjectType to built in types. This table shouldn't be modified, but since this project type did not work before it is safe to add.
• Fix bug if a ProjectType has configuration rules to set Deploy to true instead of false.
• Add missing string to StringTable and test to ensure new well know strings are added to the table.
• Update some comments to be clearer and more consistent