fix a few remaining compile errors
first step to merge JazVal and JazSExpr

this doesn't even almost compile. lots of work to do still.
remove qbrt submodule

not gonna use this anymore
fix compile errors after merging jazval & jazexpr

still a lot to change, but wanted to checkpoint this
fix a lot of compiler errors after one big change

this is just interim point where the compile succeeds.
still have other big changes to make before trying to see anything working