Rotations only took cosine of the angle, but this is not enough to
determine all possible angles. create_rotation now takes sin of the
angle too. Modified tokens to have a second value to accomodate this
change
Storing the cosine of the angle inside the token allows for faster
rotation matrix computation. Because the rotation matrix uses the
sin/cos of the angle, we can precompute the cosine and find the sine
quickly using cosx^2+sinx^2=1. This means we only need to compute the
sin/cos once, and we can potentially precompute it at compile time.
Separating fractal generation run from ruleset generation. After the
ruleset is processed, there is no reason for the group characteristics,
etc to still be used. Additionally, this will avoid the possibility of
the user attempting to use the fractal before ruleset is created and
processed.
Other changes:
Branch rules now use unioned weighted or unweighted group.
Rewrite ruleset creation usage
