Copter-4.6.0-beta4 released for beta testing!

ArduCopter Copter 4.6
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33

I did some quick testing and…
after reverting latest commit


SHA-1: 3e2428334b23f051c1e93bf4674f0e8429f20323

* AP_Proximity: correct length sanity check

the length field is actually the count of 3-byte data elements

it works fine again.