large code cleanup (#8364)

* Remove redundant qualifiers in filament public headers

* remove redundant qualifiers in filament implementation

* remove redundant qualifiers in libutils public headers

* remove redundant qualifier for libutils implementation

* remove redundant qualifiers for libmath

* use is_same_v<> instead of is_same<>

* bring back Builder::name()

we keep Builder::name() on all object, and forward to the MixIn class
that does the implementation, so that we have correct documentation, and
better IDE completion.

* add missing const parameters in filament's implementation

* various source cleanup

- missing includes
- missing const
- C cast style
- superfluous inline keyword

libs/utils/src/CallStack.cpp

@@ -120,7 +120,7 @@ bool CallStack::operator<(const CallStack& rhs) const {
 
 // ------------------------------------------------------------------------------------------------
 
-utils::CString CallStack::demangle(const char* mangled) {
+CString CallStack::demangle(const char* mangled) {
 #if !defined(NDEBUG) && !defined(WIN32)
     size_t len;
     int status;
@@ -135,7 +135,7 @@ utils::CString CallStack::demangle(const char* mangled) {
 }
 
 
-utils::CString CallStack::demangleTypeName(const char* mangled) {
+CString CallStack::demangleTypeName(const char* mangled) {
     return demangle(mangled);
 }