Simplify Subresource Saving
Simplify Subresource Saving

Redo edited subresource (and resource) saving in a much more simplified way.
I think this should work (unless I am missing something) and be faster than what is there.
It should also supersede #55885.

I am not 100% entirely convinced that this approach works, but I think it should so please test.

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