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Handle Symbol values in pretty-printer and debugger

Philip Chimento requested to merge ptomato/gjs:symbols-in-debugger into master

Adds support to the pretty-printer for Symbol values. Symbols can't be converted directly to strings, so previously these may not have printed correctly.

Symbols are pretty-printed, as far as possible, as the source code that would have to be used to create them. That is, global symbols are printed as Symbol.for("..."), well-known symbols such as Symbol.hasInstance are printed with those names, and unregistered symbols are printed as Symbol("...").

Adds support to the keys command in the debugger to print out all of the symbol-valued keys of an object as well. Previously, these keys would have been ignored.

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