Improve stability of plugin enabling/disabling

[ThomasTJdev]

CC @juancarlospaco, what do you think?

Our recompile function is sometimes unstable. Suggestion:

1. Activate recompile from the browser UI
2. NimWC launcher stops nimwc_main subrunner
3. NimWC launcher moves nimwc_main to a backup location
4. NimWC launcher runs startupCheck(), which will recompile nimwc_main
5. If recompiling fails, NimWC launcher will move the backup of nimwc_main back and report the output of the compiling error

Using the method above, we will keep the recompling out of the subrunner, and NimWC launcher will be in control.