glTF: Fix parsing buffer data with application/gltf-buffer and image/* MIME types
glTF: Fix parsing buffer data with application/gltf-buffer and image/* MIME types

See https://github.com/KhronosGroup/glTF/issues/944 for context on the
application/gltf-buffer MIME type.

The glTF 2.0 spec supports `image/jpeg` and `image/png` which can also be
base64-encoded in buffer URIs.

Fixes #33796.

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