timeLeftOnKey & keyLimit sanity checking

Setting timeLeftOnKey and keyLimit now undergo sanity checking
when set, and the resulting values sent out on the broadcast
wire. With this, timeLeftOnKey should never be more than the
effectiveLimit, and the effectiveLimit should be set appropriately,
and other similar.
Updated help menus; dont display code  11 12 15

Help menus now have blank line at bottom. Link Code 11, 12, and
15 (message printing) debug messages don't display unless
debugLevel is over 8.
Conv blacklist, controllers, lowScript mode to 301

Converted variables blacklist, controllers, and lowScriptMode
to 301 processing: lowScriptMode is processed by Main, and
blacklist and controllers are processed by MenuHandler.
Removed sections of code related to unnecessary controllers
and blacklist processing.