Features for testing weapon tweaks

[torhu]

The beta will allow server admins to change spread, damage, and range for each weapon. It works like described ​here.

In addition to what the original patch does, the weapon properties on the clients will be kept in sync with the server, and the settings will be stored to the cvar g_weaponInfo.

Optionally, information about which weapon settings are changed from the defaults, could be printed on the client console upon joining a server.