Cleaned up the Entities tab in the F4 Menu

The entities tab looked like a bit of a mess, so I decided to expand on
it. Ammo and weapons have been split to their own collapsible lists.
Shipments now have their own list (to make things less crowded) and the
other generic entities such as printers and other custom entities will
go into the existing entities list.

In addition, I reused the concept of hiding the vehicles list when its
empty, to also hide the other 4 lists when (and if) they are empty.
Chances are that this isn't required for anything other than the
shipments and weapons list, however I felt it was needed.
Fixed some small errors
Merge branch 'testing'
Fixed #737
Fixed #736
Fixed stopsound
Fixed #739
Fixed #727
Fixed a large FPS leak in the server settings section of the scoreboard.
Scoreboard server settings buttons fixes:
* Fixed the player vs player damage toggle button text saying disable when and it was already disabled and enable when it was already enabled when clicked.
* Fixed the noclip toggle button text saying "Disable" rather than "Disable global noclip" when clicked.
Fixed small error
Added contributing file. Fixes #741
Merge branch 'scoreboard-fixes' of github.com:Bo98/DarkRP into testing
Fixed kick reason issue
Merge remote-tracking branch 'upstream/master'