Reduce tool crosshair length to 2

[seafiish]

Replaces this:

With this:

To be consistent with the circle crosshair type, and overall much less distracting.

[don-tnowe]

Mmm... it does look better, but comes at a cost of making alignment harder.

I'd rather expose it in a settings menu, so I'll keep this as a suggestion!

[seafiish]

Alignment harder? Could you please elaborate?

[don-tnowe]

[don-tnowe]

I'd like to implement this as a setting instead. Feel free to leave suggestions in #7.