GDD updates, Alt+Middle Mouse focus
- Add Pills and Earbuds (10 tiers each) to GDD and todo list
- Replace Health/Mana Elixir with Pills/Earbuds in item lists
- Add consume pills and put on earbuds animation stubs to todo
- Abbreviate Black Hole Singularity to BHS in todo and GDD
- Mark all 5 survival stats as implemented in todo
- Add Alt+Middle Mouse focus point snap in scene editor
- Fix projection matrix for non-homogeneous depth (Vulkan/Metal)
- Revert border sampler flags that caused SSAO regression
- Initialize level label position in Player constructor
- Adjust max HP, mana, and XP level scaling curves
- Add inventory and radial menu mockups to design doc