Create a `step-over` and `step-out` command

[dylandreimerink]

The step command we currently have always steps into functions, this is fine if we want to follow execution in detail, but it is very frustrating at times to have to step through every sub-function call there is. So it would be a nice feature to have a step-over command which will step to the next line within the same scope. A very similar, yet good command to have would be the step-out which will go the the first line outside of the current scope, which can be used to correct if you used step instead of step-over, or if you just want to leave the current function.