Merge develop into master

[jdknives]

As requested by Synth, we will merge develop into master although it does not compile currently.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
9 out of 11 committers have signed the CLA.

✅ SkycoinSynth
✅ Matwix
✅ Rizary
✅ grondonanicolas
✅ amherag
✅ iketheadore
✅ jdknives
✅ archerixx
✅ ivankonevv
❌ Malow
❌ PratikDhanave

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