PC-12: add a standby altimeter, artifical horizon and Hobbs time counter on the pilot side.
pc12-yasim.xml: bug fix: left and right main landing gears were swapped, affecting only differential braking.
Reference: http://cbaviation.com/wp-content/uploads/2017/06/Cockpit-3.jpg
Authored by: lbrenta 2017-12-25
Parent: [r3168]
Child: [r3170]
