Fastwalk enhancements

[Oliver]

Some minor fastwalk-enhancements, as its an command many Arcturus retros use for VIP-memberships.

Notification whether fastwalk is enabled or disabled

INSERT INTO `emulator_texts` (`key`, `value`) VALUES ('commands.succes.cmd_fastwalk.enabled', 'Fastwalk is now enabled.');
INSERT INTO `emulator_texts` (`key`, `value`) VALUES ('commands.succes.cmd_fastwalk.disabled', 'Fastwalk is now disabled.');

Auto-disable

• Auto-disable the fastwalk when switching rooms or disconnecting.