remove stray 'typename' before non-qualified names

'typename' disambiguates a qualified dependent name, telling the
compiler that something like T::iterator names a type rather than a
value. Before a plain identifier there is nothing to disambiguate: P1
is already a type, and so is PopupIndex.

The grammar wants a qualified name after the keyword, so clang reports
"expected a qualified name after 'typename'", drops the keyword and
carries on -- 15175 times, since the offending declarations sit in
widely included headers. MSVC accepts them without a word.

Semantics do not change. Both compilers already ignored the keyword,
so the partial specialisations matched before this and match after it.

The diagnostic belongs to no -W group and therefore cannot be switched
off with -Wno-, which makes deleting the tokens the only way to quiet
it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Tactical/LogicalBodyTypes/Singleton.h

@@ -42,7 +42,7 @@ private :
 };
 
 
-template<typename T> typename T& Singleton<T>::Instance() {
+template<typename T> T& Singleton<T>::Instance() {
     if (Singleton::instance_ == 0) {
         Singleton::instance_ = CreateInstance();
         ScheduleForDestruction(Singleton::Destroy);
@@ -59,7 +59,7 @@ void Singleton<T>::Destroy() {
 }
 
 template<typename T>
-inline typename T* Singleton<T>::CreateInstance() {
+inline T* Singleton<T>::CreateInstance() {
     return new T();
 }
 
@@ -74,6 +74,6 @@ inline void Singleton<T>::DestroyInstance(T* p) {
 }
 
 template<typename T>
-typename T* Singleton<T>::instance_ = 0;
+T* Singleton<T>::instance_ = 0;
 
 #endif