var to const or let

[tbo47]

I used eslint to change var to const or let. There is some var left, it's for when eslint didn't know.

I changed: ` pointerDirection: GetSet<'left' | 'top' | 'right' | 'bottom' | 'up' | 'down', this>;

To fix:

Error: src/shapes/Label.ts(231,9): error TS2367: This comparison appears to be unintentional because the types '"left" | "top" | "bottom" | "right"' and '"up"' have no overlap.
Error: src/shapes/Label.ts(263,9): error TS2367: This comparison appears to be unintentional because the types '"left" | "top" | "bottom" | "right"' and '"down"' have no overlap.
Error: src/shapes/Label.ts(300,9): error TS2367: This comparison appears to be unintentional because the types '"left" | "top" | "bottom" | "right"' and '"up"' have no overlap.
Error: src/shapes/Label.ts(303,16): error TS2367: This comparison appears to be unintentional because the types '"left" | "top" | "bottom" | "right"' and '"down"' have no overlap.
Error: Process completed with exit code 1.