SP1 Scrolling: Tests 5 and 6

I have decided not to explore the mentioned Test 5 case (partial column scroll), since again we will have the degenerated case of having to scroll most of the column most of the time, and also the scrolling is not the most time-consuming operation which is being executed.

SP1 Scrolling: Test 4

It can be found in the src/sp1-partial-inv-2 directory. Based on Test 3, but changing the algorithm which keeps track of the cells to invalidate.

SP1 Scrolling: Test 3

It can be found in the src/sp1-partial-inv-1 directory. Based on Test 2, but this one keeps track of the tiles that are present on each column, and only invalidates the cells that are affected by them.