Weapons changes

• Added sv_weaponstayrefill flag that allows refilling ammo when sv_weaponstay is on. The refill cooldown is hardcoded to be a quarter of weapon respawn time

Added following Decorate properties:

Decorate	Default	Description
Weapon.AmmoDmScale	2.5	In doom when picking up a weapon in deathmatch, it's ammo is multiplied by 2.5. You can now configure that using this property.
Weapon.AmmoSpRefill Weapon.AmmoSpRefill1	0	If this value is higher than 0, then picking up a weapon that the player already has will do one of two things: refill his ammo up to the Weapon.AmmoGive value if his ammo is below that; or else give him the amount defined by Weapon.AmmoSpRefill. If this property is set to 0, then the player will always get ammo defined by Weapon.AmmoGive property
Weapon.AmmoSpRefill2	0	Same as the above, but works for secondary ammo instead or primary
Weapon.AmmoDmRefill Weapon.AmmoDmRefill1 Weapon.AmmoDmRefill2	0	Same as three properties above, but works in PvP game modes (Deathmatch, Duels, etc.) instead of PvE (Singleplayer, Coop, etc.)
Weapon.SwaySpeed	2.2	Configures weapon sway speed and distance for players that use movesway value above 0. The Weapon.SwaySpeed value can't be set lower than 0.55, because that will make the weapon accelerate instead of decelerate. You can still set it to 0 to disable sway completely
+NOPRIMAUTOFIRE +NOALTAUTOFIRE		Same as +NOAUTOFIRE, but only affect primary or secondary fire respectively
+SEEKERMISSILENOZ		Same as +SEEKERMISSILE, but doesn't follow the target along Z axis
+NOEXPLODECEILING		When hitting the ceiling the projectile just stops instead of exploding
FPF_NOAUTOAIM		A_FireBullets flag backported from GZDoom. Disables autoaim for this attack
RGF_TRANSFERTRANSLATION		A_RailAttack and A_CustomRailgun flag. Using it transfers shooter translation to both particles and actors
RGF_EXTRATRAIL		A_RailAttack and A_CustomRailgun flag. With this flag the function will spawn one extra trail actor at the end of the trail.