[fix] Escape option values set by recipes
When recipe mutate options, options values are written to .installed.cfg without escaping buildout substitution syntax, so if a recipe sets an option value that could be interpreted as a buildout substitution, it is written as is in .installed.cfg. This can be a problem if options read from _read_installed_part_options are accessed, like it's the case with slapos patched buildout which saves installed options after an error with part installation or after each part installation when running in verbose mode.
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