Remove some deprecations.

This also fixes the param mode panel incorrectly using the global config.
Up until now it was using the global config, so only default mode aliases
would have been available, not ircd/network-specific ones.

Fortunately there aren't many param modes...

Change-Id: Ibe0986050b67264238b34abedd95f84afab5e959
Fixes-issue: CLIENT-481
Reviewed-on: http://gerrit.dmdirc.com/3280
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Kill unused method.

Change-Id: I72b7082ea890e885ca9f0d29cd043b0299d2a5a1
Reviewed-on: http://gerrit.dmdirc.com/3281
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Tidy up window menu related stuff.

Change-Id: I36bbfd5f067ab32b60ba971a969121556f58a576
Reviewed-on: http://gerrit.dmdirc.com/3282
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>