v3.12.0 (#4282)

* Use `parameterWithMeta` to get parameter data in <ParameterRow>

* Prefer specPath when fetching resolved subtrees in OperationContainer

* Add test for OAS3 callback rendering

* Remove debugger statement

* Pass base resolution URL directly to Swagger-Client subtree resolver

* Remove accidental comment

* Migrate additional options

* Don't default to empty Map when getting subtree

* fix(validateParam): check for ImList type before using count method

* Use `replaceState` to update `urls.primaryName`

This gives us the stateful URL we want, without:
(a) refreshing the page on update
(b) creating a long, useless history for the user
(c) implying that browser history is two-way bound
    to Swagger-UI (it isn't, we don't have a router)

* Add `fn.opsFilter` docs and internal API versioning note

* restrict `x-example` functionality to Swagger 2.0

* polish Authorize + Close buttons

* add tachyons; use it for padding the new Reset button

* v3.12.0

* rebuild dist

src/style/_authorize.scss

@@ -21,6 +21,7 @@
     .authorize
     {
         padding-right: 20px;
+        margin-right: 10px;
     }
 }
 

src/style/main.scss

@@ -1,5 +1,6 @@
 .swagger-ui
 {
+    @import '~tachyons-sass/tachyons.scss';
     @import 'mixins';
     @import 'variables';
     @import 'colors';