[DONE] Info about special weapons saved in the savegame

[Meridian]

Special weapons are weapons that are not part of the unit inventory, for example ALIEN_PSI_WEAPON or STR_LOBSTERMAN_MELEE_WEAPON.

Until now, these weapons were not saved in the savegame.

Since OXCE v7.0, these weapons are also saved.
This means you can make limited-use special weapons (without resetting the remaining ammo when reloading the game), or use script tags.

The saves are backwards-compatible with older OXCE versions and also with OXC.