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/CMakeLists.txt

@@ -9,7 +9,6 @@ set(SOURCES
     Bindings/Intrinsics.cpp
     Bindings/LegacyPlatformObject.cpp
     Bindings/LocationConstructor.cpp
-    Bindings/LocationObject.cpp
     Bindings/MainThreadVM.cpp
     Bindings/OptionConstructor.cpp
     Bindings/PlatformObject.cpp
@@ -262,6 +261,7 @@ set(SOURCES
     HTML/HTMLUnknownElement.cpp
     HTML/HTMLVideoElement.cpp
     HTML/ImageData.cpp
+    HTML/Location.cpp
     HTML/MessageChannel.cpp
     HTML/MessageEvent.cpp
     HTML/MessagePort.cpp