LiquidAss v0.2.4

Adds the assPod nano: a 2nd-generation nano body for the assPod, beside the original.

• assPod Model on the pod's main menu switches between Video Gen 1 and Nano Gen 2. Color lists the current model's finishes: Black and White for the Video; Silver, Green, Blue, Pink, Black and (PRODUCT)RED for the nano.
• The nano: anodized aluminum with a fine grain and a laser-etched back, white end caps, and a click wheel that rocks and presses. It's rendered with real shaders like the Video.
• Its screen: the same menus, laid out for the nano's smaller screen with larger text (six rows, like the real one). The nano plays music only; videos stay on the Video.
• Your choice is kept: the model and colours you pick are saved (~/.config/glass-shell/asspod.json) and come back every time you open the assPod, across LiquidAss and SteamVR restarts. Uninstall removes the file.
• Fixes:
  • A faint hairline rectangle around the pod is gone.
  • The left stick now behaves exactly like the right. Tilting it down or left no longer presses the centre button or Menu. (The left controller's face buttons no longer act as centre and Menu; the right controller's A and B still do.)