addressing pull request feedback
if availible use lowered function, also start changing to default argument
renamed HumanRedableStmt::s to HumanRedableStmt::stmt
for compile_to_simplified_lowered_stmt changed get_jit_target_enviroment to get_target_enviroment
added fmt object and newlines to arguments list to make more readable
moved the StmtOutputFormat enum to make it more usable