Debugger: Tilemap Viewer - Add 8x8 option to Edit Tiles menu and View in Memory for attribute value

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@SourMesen

The Edit Tiles context menu in Tilemap Viewer has been a very useful feature but occasionally a few more tiles would be helpful. I figured a jump to the next power of 2 should be plenty going forward.

Tilemap Viewer was also lacking a menu item to jump to the attribute value in memory. Before one had to take note of the attribute address, open Memory Viewer, select PPU Memory, and goto the address. A context menu is much more convenient. I patterned the text after the two add breakpoint items.

(Sorry about the whitespace changes, it's a setting in my editor and I didn't notice them until now since they're ignored in my command line diff.)

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Might want to review with whitespace ignored.

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@SourMesen
These are features that I requested on the nesdev forums in January of last year so they might be on your todo list.

[SourMesen]

Thanks for the PRs!

I'm unfortunately going to be busy with RL stuff for the next 3 weeks, and likely won't have the time to look at these until around the end of April, sorry!

At first glance the code seems fine, so I should be able to merge these once I get back home.

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Thanks for the heads up. Safe travels.