reimplement gate activation logic

[alucard87pl]

• gate activation as a separate event that can result in failure
• gate checks if address valid on encoding of last glyph:

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Properly implemented dialing modes:

• DHD: click-to-select
• SGC: encode-dial-check
  • IMPORTANT: https://stackoverflow.com/questions/57049595/iterate-over-looped-array
• MANUAL: like SGC, but with ring manipulation