Made some changes to set up the mod for 1.6.*.
Made some changes to the way tasks work.
Implemented a renderer based on the approach used by Mineshot as well as some of it's code.

* Images are made by capturing tiled screenshots which can then be assembled into an image.  This solves the problem with the old approach, which ceased to render images larger than the screen.
* Rendering is performed by manually calling updateCameraAndRender() instead of waiting for the natural rendering. This means that rendering can be perfomed in one sequence without having to disturb the user.
With the new way of rendering, separate ticks aren't necessary anymore.
Changed to a single tick system. (See previous commit)
Added two new projections to the converter, "Mollweide" and "EckerIV", and did a bit of cleaning.
I've decided to put the code in the public domain rather than under the LGPL licence, so the licence files go in the trash bin.
Various minor changes and clean up.