Added a scrollable score history area in the song menu. Clicking on any score button will open the ranking screen.
Details:
- All drawing is performed by ScoreData.
- Store scores for the current focus node, and display up to "MAX_SCORE_BUTTONS" at a time; "startScore" is the starting index.
- When hovered over the score area, show scroll bar if needed. When hovered over individual score buttons, change colors and show the rank.
- Scrolling with the mouse in the score area overrides song scrolling.
- Store scaled grade images as a Grade field.
Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>
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