Static[T] fixes (#7333)

* fix the usage of unresolved static[T] parameters in proc signatures
* fix tsametype and tmacrogenerics
* Allow creating composite type classes with concepts and using them in type signatures
* Allow integers to be used in ident concatenations
* Support using imported C++ generic types in proc signatures
* fixes #7230
* closes #7379
* re-enable some metatype tests

tests/cpp/tcovariancerules.nim

@@ -300,7 +300,7 @@ reject wantsVarPointer2(pcat)
 
 # covariance may be allowed for certain extern types
 
-{.emit: """
+{.emit: """/*TYPESECTION*/
 template <class T> struct FN { typedef void (*type)(T); };
 template <class T> struct ARR { typedef T DataType[2]; DataType data; };
 """.}

tests/cpp/tvector_iterator.nim

@@ -2,7 +2,7 @@ discard """
   targets: "cpp"
 """
 
-{.emit: """
+{.emit: """/*TYPESECTION*/
 
 template <class T>
 struct Vector {