Step over

[tolauwae]

Add a STEPOver debug message to step over function calls (both direct and indirect).

Implementation works with a unique mark, a breakpoint that gets removed whenever the virtual machine gets paused. The step over runs the code until the mark, or an earlier breakpoint.

[tolauwae]

TODOs:

• [x] test with indirect call
• [x] remove mark on any pause
• [x] add unit test in latch