* All usages of getdate() are changed to the system value
* All usages of newid() are chagned to the system value
* Removes the hacks associated with the above
* Fixes the fluent migrations for table creation for mysql to not double create a PK
* Removes other system field values that actually don't do anthing and shouldn't be used
Helps determine if valid database exists and which version it corresponds to.
On startup the legacy connectionstring is used if one exists, so its not ignore but rather reconfigured.
Relates to U4-1520.
Adding a MediaTypeMapper similar to the ContentTypeMapper, but type specific.
The PetaPoco IMapper implementation is removed as its no longer needed.
Updating a few unit tests, as the Where clause is now correctly formatted.
Adding unit tests for the new ExpressionHelper and MappingResolver classes.
