Add alter pages in serverbrowser and improve favourites

Alter pages in serverbrowser were implemented with use favourites feature.
Categories of favourites (names), which will be displayed in alter pages,
have to be included in "serverbrowseraltpages" alias (accessible also
in "edit favourites" menu).
Switching between alter pages is possible with use ALT + mouse wheel or
"[", "]" keys.

The commit adds also MATCH category to favourites, shows category name
in settings of favourites and cleans up some tabs.