2.0 :  Current inav-development from 2018-05-25 [flight tested].

note 0: iNav 2.0 targets post 2018-05-05 compiled with GCC 8.1

note 1: any 1.9.1 targets are built from `master` and contain no additional features

2.0 FYI:
* dev 2.0 requires configurator 2.0 (Linux users can build standalone version for ia32 and x86_64 at http://seyrsnys.myzen.co.uk/inav-configurator-linux/)
* Other OS can run the unpackaged extension in Chromium / Chrome (just like the old days)
* reading https://github.com/iNavFlight/inav/wiki/Legacy-Mixers may help too (1).
* The 2.0 hex files
  - Include "Refactor SBUS handling code (potential race condition fixed)" (PR #3110)
  - Include the configurable `switch_disarm_delay` setting (default 150ms, PR #3118))
  - Include new `inav_reset_home` default EACH_ARM
    Allowed values: NEVER, FIRST_ARM, EACH_ARM

* The acc calibrated is reworked for 2.0. It has been suggested that
  you should recalibrate the acc. I haven't and have no issues on 5
  different machines, but at one other developer has experienced
  strange acc behaviour. You have been (mildly) warned.

In theory, the 2.0 hex files *should* work properly with FrSky R9 RX.

E&OE

(1) CLI mixer examples

# Tricopter
# mixer
mmix 0  1.000  0.000  1.333  0.000
mmix 1  1.000 -1.000 -0.667  0.000
mmix 2  1.000  1.000 -0.667  0.000
# servo mix
smix 0 5 2 100 0

# or
# to reverse yaw servo without `smix reverse`
smix 0 5 2 -100 0

set platform_type = TRICOPTER
set model_preview_type = 1

#QUADX
# mixer
mmix 0  1.000 -1.000  1.000 -1.000
mmix 1  1.000 -1.000 -1.000  1.000
mmix 2  1.000  1.000  1.000  1.000
mmix 3  1.000  1.000 -1.000 -1.000
set model_preview_type = 3

# Flying Wing (from configurator defaults)

# mixer
mmix 0  1.000  0.000  0.000  0.000
mmix 1  1.000  0.000  0.000  0.000
# servo mix
smix 0 3 0 50 0
smix 1 3 1 50 0
smix 2 4 0 -50 0
smix 3 4 1 50 0

set platform_type = AIRPLANE
set model_preview_type = 8