Amstext+wl unicode convert

[rocky]

Go over character tables

• Separate entries with a blank line
• Remove "unicode-equivalent" when it is the same as "ascii"

Because of this, wl_to_unicode() needs to use "ascii" when there is no unicode-equivalent, but "has-unicode-inverse" is set.

• Add test that unicode-equivalent isn't the same things as ascii
• Include ASCII operators in tables
• Correct DifferentialD unicode - it was correct in master . Note: \U0001D451 != \u1d451
• Add conversion table ascii-operator-to-name to convert an ASCII operator to its WMA name

[rocky]

As suggested in https://github.com/Mathics3/mathics-scanner/pull/43#issuecomment-1250410661 it is possbile that ascii-operator-to-name is not what is needed in Mathics core, but rather ascii-operator-to-unicode (the standard unicode not the WMA unicode since most non-WMA front-ends don't have WMA fonts installed). Of course there could also be a ascii-operator-to-wl-unicode but let's add that only when it becomes necessary.

That said, let's merge this now and feel free to drop or add tables as it becomes necessary based on how Mathics core handles ASCII to unicode conversion of operators.