Rustlings 6.4.0

Added

• The list of exercises is now searchable by pressing s or / 🔍️ (thanks to @frroossst)
• New option c in the prompt to manually check all exercises ✅ (thanks to @Nahor)
• New command check-all to manually check all exercises ✅ (thanks to @Nahor)
• Addictive animation for showing the progress of checking all exercises. A nice showcase of parallelism in Rust ✨
• New option x in the prompt to reset the file of the current exercise 🔄
• Allow dead_code for all exercises and solutions ⚰️ (thanks to @huss4in)
• Pause input while running an exercise to avoid unexpected prompt interactions ⏸️
• Limit the maximum number of exercises to 999. Any third-party exercises willing to reach that limit? 🔝

Changed

• enums3: Remove redundant enum definition task (thanks to @senekor)
• if2: Make the exercise less confusing by avoiding "fizz", "fuzz", "foo", "bar" and "baz" (thanks to @senekor)
• hashmap3: Use the method Entry::or_default.
• Update the state of all exercises when checking all of them (thanks to @Nahor)
• The main prompt doesn't need a confirmation with ENTER on Unix-like systems anymore.
• No more jumping back to a previous exercise when its file is changed. Use the list to jump between exercises.
• Dump the solution file after an exercise is done even if the solution's directory doesn't exist.
• Rework the footer in the list.
• Optimize the file watcher.

Fixed

• Fix bad contrast in the list on terminals with a light theme.