Parsing and localization fixes

What's Changed

• Fix save parser test, and fix error in parsing old saves by @chennin in #124
• Fix parsing = in string; fix unsafe string slicing in debug code by @MichaelMakesGames in #128
• Update greenlet to fix build on newer Macs by @chennin in #136
• Fix warnings about invalid escape sequences by @chennin in #135
• Bump dash from 2.7.1 to 2.15.0 by @dependabot in #133
• Bump jinja2 from 3.1.2 to 3.1.4 by @dependabot in #142
• Bump pillow from 9.4.0 to 10.2.0 by @dependabot in #132
• Bump flask from 2.2.2 to 2.2.5 by @dependabot in #123
• Bump pillow from 10.2.0 to 10.3.0 by @dependabot in #144
• Improve Windows build speed by @chennin in #145
• Bump fonttools from 4.38.0 to 4.43.0 by @dependabot in #130
• Bump tqdm from 4.64.1 to 4.66.3 by @dependabot in #139
• Fix loading loc files on Windows; change some mod errors to warns by @MichaelMakesGames in #146

Full Changelog: v6...v6.1