Update (medium sized) Thanksgiving day

We have a few updates here, some of them include;

• Drop system expanded to drop more items and a way to add later.
• powerups added so that the base weapons can be equipped, and upgrading them happens during gameplay.
• Hud graphics updated with some visuals that show stats like life / shields. (left side progress bar not started yet)
• New NPC characters (some gleaned from (Irmandito's Space ship sprites)

Take a look!