Tweaks on c-ts-mode fontification rules

Tweaks on c-ts-mode fontification rules

Changes:
1. Remove some :override flags
2. Fontify "!" in font-lock-negation-char-face
3. Use some new faces like font-lock-escape-face and
   font-lock-property-face
4. Move all type fontification into 'type' feature.  Previously some
   are in 'definition' feature.
5. Simplify definition feature, and fontify identifiers in definitions
   recursively.
6. Change 'statement' feature to 'label'
7. New feature 'assignment'
8. Remove some rules from 'expression' feature

* lisp/progmodes/c-ts-mode.el (c-ts-mode--font-lock-settings): See
above.
(c-ts-mode--fontify-declarator): New function.
(c-ts-mode): Update feature-list.