Delay to enable capturing PID of short lived :Start
Fix output of :Focus when focused on command
Fix activators to require living pid
Use feedkeys() to bypass synchronous press enter prompt

This is pretty hacky so there's a reasonable chance it will need to be
rolled back.
Tweak pid checking logic to accommodate blank file

Word on the street is that Windows XP home doesn't have WMIC, and if
that's the case, the likely outcome is that pid file comes up empty.
Let's not block in that case.
Show PID