New timer bars features

[alexguirre]

Currently timer bars are missing some features seen in the vanilla game.

• Changing the text color.
• Highlight: done by drawing all_white_bg on top of the timer bar background.
• Accent:
• Markers: lines that can be placed at specific percentages of a progress bar.
• Icons: similar to menu badges, with a predefined set of sprites allowing the user to specify their own.
• Checkpoins: small gray circles that get colored when completed and black when failed which can also be crossed out.