Tools and Exports, oh my!

Added some new tools to the main UI

• Pencil
• Eraser
• Paint Brush

The pencil and eraser were already accessible, but now they have cool buttons too

Added the File menu

In the file menu, you'll see buttons for undo/redo, clear, and export! You can now export your animations as a gif, probably don't export one-frame gifs, since idk what that'll do. I'll just make it export a png, eventually

For you power users

More shortcuts!

• B : Pencil
• E : Eraser
• G : Brush
• Ctrl+E : Export
• 1-5 : Swap Color (works mid-line too)
• Tab : Opens/closes the toolbar

That's all, folks

Is anyone gonna read this? Type "doodle" in the comments if you made it this far, and be sure to like and subscribe for more features, and like, give me all your money too, that'd be nice :3