Precise perf logs history

[jpbruyere]

Each changes should be validated with a precise performance log of each part of crow. (update, layouting, etc)
This log should reference the commits, and be kept over time to ensure Crow is optimized the best way.

The rendering should also be checked on each changes with saved bitmaps containing the expected results. The basis for those tests exists in the UnitTest project and should be improved.