updated structures for 1.20

since 1.20 is going to be about making minecraft more welcome, then why not update some of the structures, for example desert villages could be changed to be more oases themed (since camels are found in desert villages) desert temples and jungle temples could have a more pyramid shape and maybe camps for the wandering traders and/or pillagers. if this does not work maybe their could be variants of different structures, for example a desert temple could have a pyramid variant, a dungeon variant (more puzzle based) and a chamber variant (the one we have now) 

Thank you for such a good game, minerface9