FlightGear - Flight Simulator FGAddon

J3Cub: Fix YASim panel

Citation: fix a thinko.

Citation version 4.3: add windshield icing.

* Systems/icing.xml: new.
Windshield temperature is the same as outside air temperature plus 18K
if windshield bleed air is "LOW" and plus 60 K if "HIGH". Bleed air
requires electrical power on the main_left bus and at least one running
engine.
Window icing occurs within 100 seconds if windshield temperature drops
below 0°C and relative humidity is high.

* Citation-II-common.xml: load it as a new property-rule.

* Models/Instruments/electricpanel.xml: add rotate and pick animations
and a tooltip to the "W/S BLEED AIR" switch.

777: Launcher previews (a few to start with, more to be added later)

B-25 version 2.1.1: bug fixes and multiplayer improvements.

Multiplay protocol changed slightly:
- bug fix: the engines of a remote B-25 were always smoking due to abusing
float properties as booleans and comparing them with the string "true".
Send them as booleans (requires fgfs 2017.2 or newer) instead.

- Optimization: do not send engine rpm twice as engines/engine[*]/rpm and
sim/multiplay/float[4,5]; remove the latter.

- use /gear/gear[*]/wow directly in animations. Send them as generic bool
properties instead of floats.

- Transmit the caster angle of the nose wheel as a generic float.

* Models/b25.xml (nasal/load): rewrite as described above.
(nose gear): bug fix: animate using gear/gear[0]/caster-angle-deg, not
rudder-pos-norm.
* Models/main_Chrome.xml, Models/main_Default.xml (nasal/load): delete,
was never executed.

SUMPAC: Kremer course range diolog and modifications

Better sounds, livery improvements and addition by rjrm (FG Forum)

777: Merge stable trunk into 2019.1 - Maintainer Requested

777: Merge stable trunk into 2018.3 - Maintainer Requested

777: Add FlyByWire System and various Misc Fixes

- A/P: Modified to interface with FBW
- FCS: Corrections including trim handler to try and correct bad YASim behavior
- FBW: Roll Control Law with protections, Pitch C*U Law with Flare Mode, vague protections, and Trim Ref Speed, Yaw Damper+Turn Coordinator and Yaw Ratio
- PFD: Bugfix the IAS indicator and add an optional FBW bug to show Trim Ref Speed
- Sim: Misc Fixes, Add support for mouse yoke and keyboard/joystick trim controls to control Trim Ref Speed
- VC: Add Switches for PFC properly, and fix cockpit trim controls