CLR types don't get converted correctly when allowing auto-registration of userdata

[redxdev]

When using automatic registration of types, the table from here isn't true for the more complex types (type/methodinfo/list/dictionary/enumerable/etc) due to ClrToScriptConversions.ObjectToDynValue using UserData.Create to check if the value is valid userdata.

The problem is that UserData.Create will (almost?) always end up auto-registering whatever type you pass and never hit the block that creates the table/dictionary/method/etc.

The fix is probably to check whether the passed object is of a registered type first:

• If it is, create the userdata and return it.
• If it isn't, check it against the hardcoded CLR conversions (except maybe Enum -> integer, I'd expect that one to never hit if auto registration is on) and then try to create userdata.