Minor improvements

[najimovs]

This will force the use of a software (instead of hardware accelerated) 2D canvas and can save memory when calling getImageData() frequently.

https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext#willreadfrequently

[HolgerJeromin]

Why is this an improvement? Disabling hardware support seems like a bad idea ~~and I do not see use of getImageData() in this repo~~.

[najimovs]

@HolgerJeromin I agree that software instead of hardware is not a good idea. Especially for rendering.

The getImageData() function is quickly used for terrain purposes for a tile. You may also see Chrome display performance warnings.

https://stackoverflow.com/questions/74101155/chrome-warning-willreadfrequently-attribute-set-to-true

[StrandedKitty]

Thank you!