Keybind support, SSF support, huge declutter

• Add custom keybinds through config.yaml.
• Add ssf checkmark that applies the effect to Scroll Speed Factors.
• Overhaul custom easing option
  • Change field names, use the tooltip to see the new names. Uses $<letter> for better disambiguation from lua syntax and indicates a macro.
  • Change text field to be multi-line.
  • Change calculation to use eval instead. (lua engine instead of basic calculator)
• Move "per SV" button to its own section, since it should be treated as its own tool.
• Remove the coupling between the plot resolution and per SV resolution. Plot resolution is now always fixed.
• Remove calculator. The clipboard is broken so this barely serves a purpose now.
• Remove after, this can easily be achieved with the new custom easing tool.
• Remove initial scroll velocity field from the measure tool since this value can now be obtained automatically.