Move letters off the grid to make text more readable

[Nathan-Fenner]

This PR augments the cellDisplayBuffer struct with a new field, CellTextInfo textInfo that tracks information about the text qualities of the cell. When drawing text to the screen, textInfo.textMode is set to a non-zero value:

• 0: Not text
• 1: Left-aligned text
• 2: Centered text

The platform can read this information, and adjust the placement of letters to make text more readable:

Before	After

As shown in the screenshot above, most interfaces and log messages now make use of this fancier text-printing info.

I think I've ironed out all of the bugs, but it's possible that there's still some screens which display incorrectly.

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Platforms must be modified to accept the extra CellTextInfo parameter in their plotChar implementation - though it can simply be ignored if the platform doesn't want to or can't support moving the letters around. The actual display logic change is pretty small - see tiles.c for what the platform actually does to make use of this new metadata.

[Nathan-Fenner]

• This is some debugging logic, I'll remove it

[tmewett]

I don't have the foresight to know how this will be received - it definitely alters the aesthetics of things, but it is easier to read. And the implementation is quite minimal! So nice work. I think we'll give it a go

[tmewett]

Suggested change

	/// 1 : Left-aligned text [startColumn must be set]
	/// 2 : Middle-aligned text [startColumn and endColumn must be set]
	/// 1 : Left-aligned text [firstColumn must be set]
	/// 2 : Middle-aligned text [firstColumn and lastColumn must be set]

[tmewett]

Q: what about an enum?

[Nathan-Fenner]

Yep, that would be a good idea, I was being lazy.

I'll fix this after I rebase the PR to fix the conflicts.

[sszigeti]

I'm just a player and a fan of Brogue, so I'm not sure if my comment is useful, but I find the text in the "after" picture to look uneven.

For a fixed-width typeface (the original solution), it's expected to have gaps between certain letters, but the horizontal rhythm of the text is still there due to each letter being shown in a grid. In the "after" version, the tracking (the distance between each character) is too tight (e.g., "Some food"), while the word "entitled" breaks the rhythm due to the lack of kerning pairs, especially because of the larger gaps between the "tit" letters.

Of course, I truly appreciate the effort and the intent; however, I think this change is not a clear improvement.