gamemode: Implement Alive() function in player classes

This allows checking if the player is actually alive according to the current player class. Some classes are alive to the game, but not to the actual game mode, for example Spectators are alive, but not really.

source/gamemodes/prophuntextended/gamemode/player_class/class_default.lua

@@ -126,6 +126,7 @@ function CLASS:ShowSpare2() end
 function CLASS:PostThink() end
 function CLASS:Tick(mv) end 
 function CLASS:FindUseEntity(defEnt) return defEnt end
+function CLASS:Alive() return false end
 
 -- ------------------------------------------------------------------------- --
 --! Client-Side

source/gamemodes/prophuntextended/gamemode/player_class/class_hider.lua

@@ -206,6 +206,7 @@ if SERVER then
 		end
 	end
 end
+function CLASS:Alive() return true end
 
 -- ------------------------------------------------------------------------- --
 --! Client-Side

source/gamemodes/prophuntextended/gamemode/player_class/class_seeker.lua

@@ -205,6 +205,11 @@ function CLASS:ShowSpare1()
 	if GAMEMODE.Config:DebugLog() then print("Prop Hunt: Seeker '"..self.Player:GetName().."' (SteamID: "..self.Player:SteamID()..") taunted with sound '"..tauntList[index].."'.") end
 end
 
+-- ------------------------------------------------------------------------- --
+--! Shared
+-- ------------------------------------------------------------------------- --
+function CLASS:Alive() return true end
+
 -- ------------------------------------------------------------------------- --
 --! Client-Side
 -- ------------------------------------------------------------------------- --