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- Fixed bug surfacing after a bug in enum.IntFlag behavior was fixed in jump from
  Python 3.8 to 3.14.  This manifested as an exception message during
  `plugin_loaded()` event if user was using string value "DebugBits.NONE" in a
  local override for the "debugging" package setting.
- Renamed string value prefix for "debugging" setting: "DebugBit" => "DebugBits".
- Updated some internal documentation.
- Removed unused "utils" module in `lib/` sub-package.
- Replaced `assert` assertions that were being optimized away when running under
  Sublime Text since it is effectively running Python with the "-O" option,
  causing `assert` statements to be optimized away in byte code.