Previously, ol.geom.Polygon was a transitive dependency of ol.proj (since ol.proj requires ol.sphere.NORMAL, and all spheres were capable of generating circular polygons). Instead, ol.proj should be lower-level. Since it deals only with coordinate arrays, it shouldn't depend on all of the geometry code.
By adding a static `circular` function to `ol.geom.Polygon`, the dependency tree makes more sense. If you want to create a polygon that approximates a circle on a sphere, you require `ol.geom.Polygon` and `ol.Sphere` (or one of the constants).
This makes room for geometries to have a `transform` method that takes projection-like arguments (meaning that `ol.geom.Geometry` will require `ol.proj`).
This gives more consistency with ol.proj.applyTransform, allowing us to add a more convenient ol.extent.transform method that takes projection-like arguments.
Because ol.proj.EPSG4326 et al. extend ol.proj.Projection which has exportable methods, these constructors need to be exportable as well (e.g. so ol.proj.EPSG4326.prototype is defined in exports.js when calling goog.exportProperty on getCode etc.). If we really don't want these to be exportable, they should be removed or made private (and named like ol.proj.EPSG4326_) for internal use only.
This change adds a stability value to the api annotation, with
'experimental' as default value.
enum, typedef and event annotations are never exportable, but
api annotations are needed there to make them appear in the
docs.
Nested typedefs are no longer inlined recursively, because the
resulting tables get too wide with the current template.
This commit simplifies the exports.js plugin so it only relies
on the stability notes to generate the documentation, which
completely decouples it from the exportable API.
As a rule of thumb, whenever something has an 'api' annotation,
it should also have a 'stability' annotation. A more verbose
documentation of ol3 specific annotation usage is available in
the new 'apidoc/readme.md' file.
This commit also modifies all source files to implement these
usage suggestions.
