Now with Citro power

[jtothebell]

All platforms:

• Implement stretched and flipped draw modes.
• Fix "continue" menu item being able to be overwritten
• Fix menu not dismissing when selecting a custom item

3ds Specific

• use citro2d for rendering instead of direct framebuffer access. Small performance improvement when using integer scaling, large improvement when not using integer scaling

Known issues:
implementing draw modes introduced a problem with the pause menu when using them. See issue #65

3ds CIA:

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This discussion was created from the release Now with Citro power.