reboot helper for windows

Elisa, after plugin update need to reboot. We should create an external launcher (called elisa_reboot.exe).

Each time Elisa wants to reboot, application will execute it.

The launcher will start and wait few seconds.
It will check if there is any available elisa.exe or elisa_fork.exe process. if yes, it will kill them.
He will launch Elisa if needed.

elisa_reboot.exe could also be use to close the application. Today, each time we exit from Elisa, we kill the process because of a deadlock in elisa_fork.exe. It does not happens all the time, but will kill for each exit.

elisa_reboot.exe could take the following parameters:

elisa_reboot.exe [seconds] [relaunch]

seconds:
 * mandatory
 * type: integer
 * the seconds to wait before check if the process still exists

relaunch:
 * optional
 * type: boolean, default 1
 * if 1, relaunch elisa.exe