Fetch extension class props from ClassDB
Fetch extension class props from ClassDB

Extension class properties that have been registered with
ClassDB(`GDNativeInterface::classdb_register_extension_class_property`)
were not fetched previously. (Only  directly providing a property
list using `GDNativeExtensionClassCreationInfo::get_property_list_func`
would work.) This especially caused problems with the C++
bindings since they exclusively rely on ClassDB to register properties.

akien-mga/godot,BastiaanOlij/godot,Valentactive/godot,Shockblast/godot,Shockblast/godot,Valentactive/godot,vkbsb/godot,BastiaanOlij/godot,Faless/godot,Zylann/godot,josempans/godot,Faless/godot,firefly2442/godot,Valentactive/godot,vkbsb/godot,Zylann/godot,Shockblast/godot,Shockblast/godot,firefly2442/godot,sanikoyes/godot,guilhermefelipecgs/godot,Zylann/godot,godotengine/godot,sanikoyes/godot,sanikoyes/godot,godotengine/godot,akien-mga/godot,josempans/godot,guilhermefelipecgs/godot,vkbsb/godot,ZuBsPaCe/godot,sanikoyes/godot,Valentactive/godot,godotengine/godot,firefly2442/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,sanikoyes/godot,josempans/godot,guilhermefelipecgs/godot,Faless/godot,vkbsb/godot,vnen/godot,vkbsb/godot,josempans/godot,akien-mga/godot,Zylann/godot,vnen/godot,akien-mga/godot,godotengine/godot,BastiaanOlij/godot,pkowal1982/godot,pkowal1982/godot,vnen/godot,godotengine/godot,vnen/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,godotengine/godot,ZuBsPaCe/godot,josempans/godot,josempans/godot,vnen/godot,Shockblast/godot,firefly2442/godot,ZuBsPaCe/godot,Valentactive/godot,sanikoyes/godot,akien-mga/godot,akien-mga/godot,sanikoyes/godot,pkowal1982/godot,ZuBsPaCe/godot,godotengine/godot,josempans/godot,Shockblast/godot,Faless/godot,BastiaanOlij/godot,ZuBsPaCe/godot,vkbsb/godot,Valentactive/godot,Zylann/godot,Faless/godot,firefly2442/godot,josempans/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,Zylann/godot,akien-mga/godot,Shockblast/godot,BastiaanOlij/godot,firefly2442/godot,pkowal1982/godot,vnen/godot,Zylann/godot,Faless/godot,akien-mga/godot,ZuBsPaCe/godot,Faless/godot,Zylann/godot,Valentactive/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,vkbsb/godot,pkowal1982/godot,pkowal1982/godot,sanikoyes/godot,guilhermefelipecgs/godot,Faless/godot,Valentactive/godot,firefly2442/godot,pkowal1982/godot,pkowal1982/godot,firefly2442/godot,vnen/godot,vnen/godot,BastiaanOlij/godot,Shockblast/godot,vkbsb/godot,godotengine/godot