Feature request: Make the GUI more useful

[pastthepixels]

Right now there's a lot of things that's going on in the game that the player can easily be unaware of, like how much points you get after you blow up an enemy ship. In short, my idea is that we can use the GUI to highlight when some of these events happen. Here's a short list of some of the stuff that could have alerts/HUD notifications:

• [x] How much points you get after blowing up enemy ships
• [x] Current/upcoming changes for each level (ex. Difficulty reset in 5 levels, [game mechanic change] in 2, or [an image indicating an enemy type] in 6)
• [x] Elemental types of lasers acquired (ex. fire/ice/corrosion)
• [x] How much coins you get after blowing up a coin crate
• [x] How much levels are next until the next warp/reset (every 10 levels)

[pastthepixels]

Since as I mentioned in #8 I already added a warp screen, there should be some kind of indicator for how much levels are next until the next warp/reset. I'll edit the issue description

[pastthepixels]

I've been working hard to get one more issue closed before the end of the year, and now that I've finished everything outlined in the checklist, can't think of anything else to add, and have tested it to make sure everything works, I'll merge the branch enhance-gui before the end of the year (probably later today)!