Mono/C#: Fix class parser bug with 'where T : struct'
Mono/C#: Fix class parser bug with 'where T : struct'

The struct decl parsing was outdated. Make both struct decl and class declparsing share the same code.

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