Fix circular imports

[lourot]

$ npm run build
[...]
┌──────────────────────────────┬──────────┐
│ File name                    │ Size     │
│ ---------------------------- │ -------- │
│ image-display-control.min.js │ 17.88 kB │
│ ---------------------------- │ -------- │
│ Totals                       │ 17.88 kB │
└──────────────────────────────┴──────────┘
(!) Circular dependencies
dist/src/PositionInRelativeCoord.js -> dist/src/PositionInPixels.js -> dist/src/PositionInRelativeCoord.js
dist/src/SizeInPixels.js -> dist/src/SizeInRelativeCoord.js -> dist/src/SizeInPixels.js
created ./dist/image-display-control.min.js in 546ms