Allow using only types in TEMPLATE_TEST_CASE_SIG.
#2995
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Right now `TEMPLATE_TEST_CASE_SIG` fails to compile when the signature contains only types:
```
TEMPLATE_TEST_CASE_SIG(
"TemplateTestSig: compiles with two type parameters",
"[template][onlytypes]",
((typename U, typename V), U, V), (int,int)) {}
```
The trick is to resolve the ambiguity between the two overloads of
`get_wrapper` (`TypeList` and `Nttp`) by making one match more strongly.
We also need to allow `reg_test` to register more than one type.
Add unit tests.
Fixes catchorg#2680
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Right now
TEMPLATE_TEST_CASE_SIGfails to compile when the signature contains only types:The trick is to resolve the ambiguity between the two overloads of
get_wrapper(TypeListandNttp) by making one match more strongly. We also need to allowreg_testto register more than one type.Add unit tests.
Fixes #2680