Replace characters in the Graphical Overmap mod with escape sequences #36535
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Summary
SUMMARY: None
Purpose of change
Currently the overmap symbols in the Graphical Overmap mod are written as characters. However, these characters are actually used to draw different symbols, and look like gibberish when viewed in a text editor, making it hard to locate each symbol in the font image. This can be merged once #36538 gets merged.
Describe the solution
Specify the characters using escape sequences, so it's easier to locate the symbol in the font image by looking at the hexadecimal number.
Testing
Tested in game and the symbols are correctly displayed as before. Also used the JSON formatter without #36538 to convert the escape sequences back to characters, and the resulting files were identical to the files before this change.