clean up the ROTG, ROTM, and ROTMG code

[cartazio]

currently it exposes the complex storable by reference style interface, which i'm removing for now, because I dont think it makes sense,

likewise, I think those calls could/should always be unsafe calls, which would further make them super performant, because they a) always take ~ constant time that should be at most a few micro seconds, and b) that probably would relax any allocation overheads, unless the underlying code has stronger alignment assumptions that word based alignment