Add alternative views in serverbrowser and improve favourites

Alternative views in the serverbrowser are implemented with use favourites.
Categories (names) of favourite servers, which will be displayed on the
views, have to be included in "serverbrowseraltviews" alias (accessible
in menu).
Switching between views is possible with use Alt + Mouse wheel and
Alt + Up/Down (or eventually "[" and "]", if they are dedicated keys
on your keyboard).

The commit also:
1. adds MATCH category to favourites;
2. shows category name in settings of favourites;
3. shows weights in serverbrowser instead of favourites image,
when showweights = 1;
4. cleans up some tabs.
Fix reset of packages source servers list

Earlier "resetpckservers" command cleared this list, instead of reset
to the initial settings.
Add the clock to scoreboard and change clockdisplay

Commit adds the clock in format mm:ss to scoreboard, instead of
"X minutes remaining" info.
It also enables default the clock on the HUD and adds clockcount variable,
which let to choose between counting forward or backward in the clocks.
Change position of "SCROLL/SPACE..." HUD messages

Now "SCROLL/SPACE..." messages will be visible on the right side
of display, in every standard aspect ratio.
Fix output messages in console

Fixes:
1. show time remaining in system console after each minute;
2. correct form of "minute(s)".