V0.7 is out! Art overhaul & coin system

Hey again! In 0.7, me and my artist have been pretty intently working on finishing up the game over the past few days. We've changed almost all of the menus, buttons, and bomb art with some nice movement polish.

Changes
- Bubbles now appear in the main menu and difficulty menu selection. Pop them for fun!
- Buttons and titles wobble
- Coin bubbles appear in game. Click on them to gain currency (Shop WIP)
- Added credits screen & button
- Tutorial is now slightly more interactive.
- Added icons for color blind accessibility.
- Misc speed/spawning changes.