libhexen: Added a values.ded

The amount of mana given to players when they respawn in multiplayer
games is now defined in Hexen's values.ded.
Fixed|Multiplayer|Hexen: Player's weapon after respawn

In Hexen MP, players are given their old weapons and keys back, and
some mana. This commit fixes an issue where the client wasn't notified
that the readyweapon was changed by the server to the best owned one.

The amount of mana is now defined in Values.
Merge branch 'master' of ssh://github.com/skyjake/Doomsday-Engine