* [ios, macos] Fact-checked expression guide
Corrected various factual inaccuracies in the “Predicates and Expressions” guide. Moved some explanation from the predicates section to the expressions section. Added sections for all the other expression types we support.
* [ios, macos] Reorganized custom function documentation
Reorganized the custom function documentation as a series of sections with headers and definition lists instead of a monolithic table. Copyedited various sections for accuracy. Linked references to custom functions. Added format string examples for all custom functions.
* [ios, macos] Made h3 more visible
* [ios, macos] Added Objective-C example of placeholders
* [ios, macos] Documented trig functions
* [ios, macos] Also increase h3 code size
* [ios, macos] Replaced Markdown with HTML in definition
* [ios, macos] Replaced Markdown with HTML in custom function documentation
* [ios, macos] Clarified stops
* [ios, macos] Cross-referenced functions
Each custom function definition cross-references the corresponding aftermarket function (or vice versa), the corresponding style specification expression operator, and any related NSExpression syntax.
* [ios, macos] Fixed links in predicate guide
* [ios, macos] Consolidated and documented NSExpression categories
Consolidated the NSExpression categories into a single category, with marks to separate different tasks. Documented the MGLAdditions category so that it shows up in the jazzy documentation.
* [ios, macos] Fixed NSExpression private category mixup
* [ios, macos] Italicize protocols, abstract classes in doc nav
Italicize protocols and abstract classes in the generated documentation’s navigation sidebar.
* [ios, macos] Denote protocols, abstract classes with glosses
Instead of oblique text, use a parenthetical gloss to denote a protocol or abstract class.
- Based on Jazzy's "full width" theme.
- Add ellipsis to overlong items in navigation menu.
- Set minimum width for navigation menu.
- Use Open Sans font face.
- Inline GitHub header icon as SVG.
- Center images by default.
- Add GitHub SVG icon to 'show on github' link.
- Wrap overlong method names on class pages.
