Added the server ConVar 'ttt_propkillers_private'

Added a ServerLog display for notifications.

Renamed Lua files to make them unique. Moved the initialization script to server only.

Added compatibility for Evolve ranks.

Now user groups are case-insensitive.

• ttt_propkillers_canadd - Allowed groups to add propkillers to the list, separated by a semicolon.
• ttt_propkillers_canremove - Allowed groups to remove propkillers from the list, separated by a semicolon.
• ttt_propkillers_temp_canadd - Allowed groups to temporarily add propkillers to the list, separated by a semicolon.
• ttt_propkillers_temp_canremove - Allowed groups to temporarily remove propkillers from the list, separated by a semicolon.

- Cleaner code: now it directly modifies the SWEP table instead of modifying each magneto-stick when created.
- The color of players' names were not set for non-admins. Now they are. A related bug probably produced errors while attempting to live-update a player's propkiller status on non-admin clients.

Someone reported an error: menu.lua:169: attempt to index global 'ply' (a nil value)
It is now corrected. I have never got this error.

Does not use the hook PlayerAuthed anymore. This allows to use this addon in LAN only and Single player, and it works immediatly.