Work through each BOLT and fill out error conditions

[TheBlueMatt]

Need to make sure we're compliant with all the various actions we're supposed to take as specified in the BOLTs, as well as ensure ErrorActions are always Some() in HandleError. Some of these should be pretty easy, some will be way more involved.

• BOLT 1
• BOLT 2
• BOLT 3
• BOLT 4
• BOLT 5
• BOLT 7
• BOLT 8
• BOLT 9

BOLT 10 we don't have any implementation of yet (#58), and BOLT 11 is in rust-lightning-invoice.

[TheBlueMatt]

I think we're already good on BOLT 8 as there aren't really any "requirements" in it aside from the crypto spec, which we handle fine, and any errors result in disconnection, which I believe is correct.

[TheBlueMatt]

AFAICT, BOLT 3 stuff is all correct, again there aren't many requirements there just a list of scripts and tx formats, all of which should pretty immediately result in failing to send signatures to channel peers, but I read through it again as well and didnt see anything obvious.

[TheBlueMatt]

Lol, github got a bit overeager, sadly.

[TheBlueMatt]

Yay BOLT 7!