Remove memory modification from todo list

Simply opening the Neko Project process in HxD and editing memory there should outweigh the time it takes to implement memory modification on our end... at least for now.

(I just found out that you actually have to hit the Save button when doing this in order to _really_ write the modifications into the process RAM)
Implement "step over"
Use winuienter() and winuileave() instead of soundmng_enable/disable or np2active_set() to pause emulation during GUI handling

The latter didn't even work in Unassemble mode.