reworked ustring.rsplit to fix behaviour.
reworked ustring.rsplit to fix behaviour.

Previous problems include failure to remove the splitter from the last
element found and a possible infinite loop dealing with multi-character
splitter strings.

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