- Removed `testHandlesEmptyTokenTree` (it was the same as `testIgnoresTextWithoutPercentSign`).
- Added tests for special characters, bad token/date formats, and basic security.
- The tests for bad date formats still fail with the updated `render` function.
- Added alternate version of `Token_lib.render` with PHP 8.4 compatability.
- Added helper function to extract the date format from a string.
- Removed an unused parameter from `Token_lib.generate`, and made that function private.
- Added partial unit tests for `Token_lib`.
