Readability problems on 13" laptops: land flags.

[ghost]

Parent issue: #186.

Laptop: MacBook Pro 13".
OS: macOS High Sierra.
Mode: Windowed, defaults.

I patched the program for outputting arbitrary text at the land flag.

I took several samples of a text with only digits, judged if I find them readable, then I added the effective font size to the dumps. It seemed my eye is comfortable with font sizes 10 or larger, meh with font sizes between 9 and 10, and table flipping with font sizes lower than 9.

length	readable	effective font size	footage
6	good	10
7	good	10
8	good	10
9	good	10
10	good	10
11	yes	~9.87
12	yes	~9.32
13	bad	~8.55
14	barely	~7.91
15	barely	~7.35
16	no	~6.87
17	no	~6.45
18	no	~6.12

No matter how much retina support we get, there always has to be some lower limit for the font size. Using these graphics configuration, I think it is 9. With more retina support I suppose that maybe could be lowered to 8 or 7. I suspect anything lower than 7 will be insane for this device in any case.

To handle this issue, I'd probably be submitting a pull request for cropping land flag texts whenever too large while having a game window width as low as @lutinotmalin's windowed mode window width or smaller.

I'm hoping this change will affect no desktop PC at all.

[ghost]

For three lanes maps the figures (simplified) are like:

length	effective font size
...	...
15	~9.30
16	~8.69
...	...

Similarly for one lane maps:

length	effective font size
...	...
16	~9.63
17	~9.03
18	~8.56
...	...