[patch][pr18928] Use printable names to implement directional labels

[Rafael Espíndola]

Hi Kevin,

The attached patch changes the implementation of local directional
labels to use a dedicated map. With that it can then just use
CreateTempSymbol, which is what the rest of MC uses.

CreateTempSymbol doesn't do a great job at making sure the names are
unique (or being efficient when the names are not needed), but that
should probably be fixed in a followup patch.

Cheers,
Rafael
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