v0.12.3 — paste a block

Paste a block of commands into the session page. The send box was a one-line input, so anything multi-step had to be sent a line at a time — and pasting a block dumped it onto one line, which then ran as a single nonsense command.

• it's a textarea: paste grows it, enter runs, shift+enter makes a new line
• the split is server-side, one queued command per line, so it works with the CLI you already have — the pit takes exactly one line per prompt turn
• lines are stamped a millisecond apart, so a paste lands in the order you pasted it
• blank lines and the trailing newline of a copied block are dropped rather than fired as bare enters; 50 lines per paste

the pit — names can be bought under someone else's TLD, paid via CoinPay (#127); numeric hostname labels and numeric labels when registering are both accepted now (#119, #120)