LibWeb: Convert the Location object to IDL

This includes:

- Moving it from Bindings/ to HTML/
- Renaming it from LocationObject to Location
- Removing the manual definitions of the constructor and prototype
- Removing special handling of the Location interface from the bindings
  generator
- Converting the JS_DEFINE_NATIVE_FUNCTIONs to regular functions
  returning DeprecatedString instead of PrimitiveString
- Adding missing (no-op) setters for the various attributes, which are
  expected to exist by the bindings generator

Userland/Libraries/LibWeb/DOM/Document.h

@@ -339,7 +339,7 @@ public:
 
     JS::NonnullGCPtr<HTML::History> history();
 
-    Bindings::LocationObject* location();
+    HTML::Location* location();
 
     size_t number_of_things_delaying_the_load_event() { return m_number_of_things_delaying_the_load_event; }
     void increment_number_of_things_delaying_the_load_event(Badge<DocumentLoadEventDelayer>);