document player properties, ed25519 auth, and utf-8 chat extensions

[Fran6nd]

Bring extensions.md in line with libspades' extension docs — adds
Player Properties (id 0), Ed25519 Authentication (id 1), and a note
about UTF-8 Chat. Also fills in the empty has-packets table in
index.md so it actually lists something.

These are not really proposals as these have already been widely adopted.

Sources:

• https://totallynotaburner.codeberg.page/libspades/extensions.html
• https://totallynotaburner.codeberg.page/libspades/packetByID.html#packets_extensions

[Fran6nd]

Up :) @utf-4096

[utf-4096]

Don’t have review permissions, but looks fine.

[Fran6nd]

Don’t have review permissions, but looks fine.

Ach sorry I thought you had it.

[NotAFile]

Oops I'll have to fix the repo permissions

[Fran6nd]

BTW, in my last commit (after PR approval) I did split the documentation of player properties into two tables to avoid having an ultra wide table. Let me know if you prefer me to merge them.

[DavidCo113]

Health, 0..100. 0 indicates the player is dead.

0--255, 0 HP in betterspades does not kill the player (that's what the kill packet is for. . .) -- does in openspades which doesn't support this packet though

Score | LE Uint

May or may not actually be a (signed) int32_t.

[Fran6nd]

Updated according to your comment @DavidCo113 I did check how score is handled but only on 3 clients though. BetterSpades, KyroSpades and ZeroSpades.

[DavidCo113]

Reference clients treat it as unsigned (BetterSpades, . . .)

Did you test it or just go off the source code? TigerSpades certainly treats it as signed, despite the struct being unsigned.