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Optimize stroke groups while drawing

The algorithm works as follows:

1. If the slope of the coordinates to be added is equal to the slope of
the previously-added point, then the new coordinates are combined into
that last point.

2. Otherwise, the coordinates are added to the stroke group as an
entirely new point.

For example, with this optimization in place, drawing a
perfectly-straight line adds only 2 points to the stroke group, rather
than a point for every mousemove.

29 of 30 branches covered (96.67%)

Branch coverage included in aggregate %.

117 of 119 relevant lines covered (98.32%)

88.23 hits per line