Fix test image folders
Added test for initial graph capabilities
Merge branch 'feature/stats-graph-tests' into develop
Implementation for filled graph
Adjust test to use fill draw strategy
Merge branch 'feature/filled-in-data-graph' into develop
Reformat pom files with spaces instead of tabs
Refactor code to follow Grapher interface
Added new Grapher type
Merge branch 'feature/refactor-graphs' into develop
Initial implementation

Uses a constant line, so not suitable for testing
Renders one line of lightning
Added zig zagging and fixed shading alignment
Merge branch 'feature/lightning-grapher' into develop