Hopefully fixed "Sneaky little goblin" being earned when surviving to the end of a round as a swapper and not a loot goblin

- Earned trophy chat messages now hide descriptions for hidden trophies only if the trophy is unearned
- Hidden trophies now have no description at all in the trophies list
- Trophy suggestions no longer show for hidden trophies
- Trophy progress updates now show regardless if a trophy is hidden or not
- The platinum trophy now shows its description whether it is hidden or not

- Added new "hidden trophies" feature where some trophy descriptions are completely hidden on purpose, other mod makers can easily do this by adding the TROPHY.hidden = true parameter to their trophy
- Made some trophies hidden
- Fixed "What are we playing?" being in the trophy list while a required randomat wasn't enabled
- Added ability for admins to toggle hiding the descriptions for trophies until they are earned
- Added "Admin options" button to the trophy list that can only be seen by admins
- Fixed typo in trophy description
- Admins can now see checkboxes next to all trophies listed to enable/disable them for everyone
- Added an admin option to hide the checkboxes in the trophies list for themselves

Fixed perfect map and 5 perfect maps trophies being earned before they should

Fixed IsBuyableItem() not detecting modified passive items

Small fix to isbuyableitem()

Modified IsBuyableItem() function so that other mod-makers making trophies can more intuitively use it.

Fixed lua error with mercenary trophy

- Finally fixed gotta buy em all trophies
- Changed descriptions of 'customise your colours' and 'fast weapon switch' trophies

Changed "420" trophy icon, now uses existing stats from "nice" trophy