remove deprecated type pragma syntax, fix bugs that required it (#20199)

* remove deprecated pragma syntax from 0.20.0

closes #4651, closes #16653 with a cheap fix for now due to
how early `tfFinal` is set

* remove type pragma between name and generics

* undo removal, try removing bind expression (0.8.14)

* fix test, unremove bind expr

* remove again

* Update changelog.md

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>

* dependencies @ HEAD & weave test dependencies

* try fix package ci

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>

tests/generics/module_with_generics.nim

@@ -1,5 +1,5 @@
 type
-  Base[T] = ref object {.inheritable.}
+  Base[T] {.inheritable.} = ref object
     value*: T
 
   Derived[T] = ref object of Base[T]

tests/generics/tcan.nim

@@ -31,7 +31,7 @@ block tinherit:
 
 block tspecialise:
   type
-    TGen[T] = object {.inheritable.}
+    TGen[T] {.inheritable.} = object
     TSpef = object of TGen[string]
 
 

tests/generics/tgeneric3.nim

@@ -12,7 +12,7 @@ import strutils
 
 type
   PNode[T,D] = ref TNode[T,D]
-  TItem {.acyclic, pure, final, shallow.} [T,D] = object
+  TItem[T,D] {.acyclic, pure, final, shallow.} = object
         key: T
         value: D
         node: PNode[T,D]
@@ -20,7 +20,7 @@ type
           val_set: bool
 
   TItems[T,D] = seq[ref TItem[T,D]]
-  TNode {.acyclic, pure, final, shallow.} [T,D] = object
+  TNode[T,D] {.acyclic, pure, final, shallow.} = object
         slots: TItems[T,D]
         left: PNode[T,D]
         count: int32

tests/generics/tinheritable_importcpp.nim

@@ -0,0 +1,10 @@
+discard """
+  targets: "cpp"
+  action: compile
+"""
+
+# #4651
+type
+  Vector[T] {.importcpp: "std::vector<'0 >", header: "vector", inheritable.} = object
+  VectorDerived {.importcpp: "SomeVectorDerived", nodecl.} = object of Vector[int]
+  # Error: inheritance only works with non-final objects