General bug fixes and enhancements

• Duration field will be disabled on AutoRoles if it is set to give roles on join. ( #1144 )
• CCs will now save and run, instead of wiping your unsaved changes (#1159 )
• "channel" carg now supports threads too. ( #1142 )
• Added "couples therapy" to thowthings.go (#1156)
• Added "urlunescape" template (#1051 )
• Removed all redundant slash commands with alternative "user-by-id" (#1161 )