New transition animation with snappy and comfy speeds

[radther]

What

• Updates the animation to a common Push Pop style animation (seen commonly on mobile devices)
• Updates the Menu transitions setting to have "Off", "Snappy", and "Comfy", with snappy being 150ms and comfy being 250ms. Both animations use an intensity of 3 with an easing of Ease out.

Why

The existing animation doesn't blend well, especially when backing out, and can look confusing with the opacity transition. The new transition should flow better.

How

1. Updates transition of the SDL surfaces
2. Fixes pill blinking on incoming screen
3. Adds animation defines for easing
4. Updates settings to handle the new options. Handles existing settings by bool 0 = Option off, staying off, and bool 1 = Option Snappy (the default)