Work on dynamic weapon system:
* Added check for WPF_NOTSHAREWARE and added flag to plasma and BFG
* Added weapon upsound field to handle chainsaw rev in P_BringUpWeapon
* Both removed and added WEAPON_FIXME's as appropriate
* Added e_weapons module, which is starting to take shape with some new ideas

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2571 86ba831e-150c-0410-ab35-e06eaae15ed9