keysymdef.h: Normalize Unicode mappings

- Normalize codepoint format to upper case.
- Fix Unicode standard names: use *corrected* names.
- Add missing Unicode mappings (see hereinafter).

Some special keysyms have Unicode mappings in both X11 and xkbcommon,
but they are not documented. As these mappings are not one-to-one, we
introduce the concepts of generic/specific compatible semantics:

- Generic keysyms such as as `Space` have a standard Unicode annotation;
- Specialized keysyms such as `KP_Space` have the same standard Unicode
  annotation between angle brackets.

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