Commands.txt: Fix some wording and spelling
Commands.txt: Reorder some commands

Reorder some commands and introduce new section "Connection Handling".
Idea by DNS <dns@rbose.org>, thanks!
Commands.txt: Import descriptions from "rbose/command_help"

Import command description texts from the "rbose/command_help" branch,
which have been written by DNS <dns@rbose.org> -- thanks a lot!
Commands.txt: Add description for the "CAP" command
Commands.txt: Add description for the "CHARCONV" command
Commands.txt: Update description of the "ADMIN" command
Commands.txt: Update description of the "INFO" command
Commands.txt: Update description of the "ISON" command
Commands.txt: Update description of the "LINKS" command
Commands.txt: Update description of the "LUSERS" command
Commands.txt: Update description of the "MOTD" command
Commands.txt: Update description of the "NAMES" command
Commands.txt: Update description of the "STATS" command
Commands.txt: Update description of the "TIME" command
Commands.txt: Update description of the "USERHOST" command
Commands.txt: Update description of the "VERSION" command
Commands.txt: Update description of the "WHO" command
Commands.txt: Update description of the "WHOIS" command
Commands.txt: Update description of the "WHOWAS" command
Commands.txt: Update description of the "SERVLIST" command