Add schema qualifier

[alexisread]

Add schema qualifier to allow generation on table name clashes for differing schema.

[alexisread]

Thought this might be useful as you can place all generated tables/views within a single namespace, even with name clashes.

[dallasbeek]

Yes, this is the first thing I saw missing in the generated code. Thank you alixisread. Please accept this merge.

[dallasbeek]

Don't merge this, needs to undo the class naming. for those peeps that have table names in multiple schemas they can use the tables["tablename"].ClassName = "newname";

but I do agree that schemas should be supported by the generator.

[alexisread]

Hi, apologies for taking a while on this - I've reverted the ClassName for compatibility. Hope that's ok to get this accepted? Thanks.

[MoonStorm]

3.0 has a ton of changes so I'm just gonna manage this merge manually. Thanks a lot!

[MoonStorm]

Playing around with it more, I don't believe assigning entities to schemas from the generator is a good idea. Entities can be tweaked later if needed.

[MoonStorm]

Decided to add the feature as an opt-in flag so it won't break existing generations. The flag will set the Schema property in the Table attribute. See #198