Use wildcard includes in the project templates

# Work In Progress

Fixes #59 

This pull request may result in unintended behavior of the project system for operations including, but not limited to:

1. Creating new files on the file system, and then attempting to add them to a project that was already open within Visual Studio
2. Renaming files using Solution Explorer
3. Drag & drop within Solution Explorer
4. Cut/Copy & paste within Solution Explorer

If any of these operations produces "bizarre" behavior, this pull request should be updated to disable the associated command at least until the behavior can be properly specified and corrected.
I don't think there's any reason to distinguish between Compile/None for dart proejcts; everything is just a FS file, and no build/run actions will ever take this flag into account?

I think just ```<None Include="**\*.*" Exclude="**\*.dartproj"/>``` makes more sense?