Support arbitrary precision and export high quality output

XaoS currently cannot support very deep zooms because the 80-bit floating-point arithmetic used runs out of precision before too long. It should be possible to add arbitrary precision to XaoS using the MPFR library ( https://www.mpfr.org/), or a different one if it is not fast enough to support real-time zooming. The second part of the project focuses on rendering very large size images to support high-quality output. Support for various colour profiles, batch output, cropping, and the cartesian grid will be added along with this. Additional improvements to XaoSjs and support for web compilation of XaoS will also be carried out.