ljgf 0.0.7 released

Another release, another backwards compatibility break.

LJGF 0.0.7 adds some minor feature improvements, such as vertical scrolling, rendering overloads to enforce redrawing, and fixes some serious issues with ParallaxBackground clipping and (viewport) location offsets for the GameField class.

Rendering was heavily improved by adding dirty area lookups for effected areas over all SpriteGroup layers, getting rid of left over artifacts on repositioning sprites and optimizing edge clipping for the GameField viewport. The RectCollisionArea code was improved by removing superfluous intersection testing, making it notably faster for medium to large sprite amounts to test.

Have fun!