[bugfix] Fix Swagger spec and add test script (#2698)

* Add Swagger spec test script

* Fix Swagger spec errors not related to statuses with polls

* Add API tests that post a status with a poll

* Fix creating a status with a poll from form params

* Fix Swagger spec errors related to statuses with polls (this is the last error)

* Fix Swagger spec warnings not related to unused definitions

* Suppress a duplicate list update params definition that was somehow causing wrong param names

* Add Swagger test to CI

- updates Drone config
- vendorizes go-swagger
- fixes a file extension issue that caused the test script to generate JSON instead of YAML with the vendorized version

* Put `Sample: ` on its own line everywhere

* Remove unused id param from emojiCategoriesGet

* Add 5 more pairs of profile fields to account update API Swagger

* Remove Swagger prefix from dummy fields

It makes the generated code look weird

* Manually annotate params for statusCreate operation

* Fix all remaining Swagger spec warnings

- Change some models into operation parameters
- Ignore models that already correspond to manually documented operation parameters but can't be trivially changed (those with file fields)

* Documented that creating a status with scheduled_at isn't implemented yet

* sign drone.yml

* Fix filter API Swagger errors

* fixup! Fix filter API Swagger errors

---------

Co-authored-by: tobi <tobi.smethurst@protonmail.com>

vendor/github.com/go-openapi/validate/README.md

@@ -0,0 +1,38 @@
+# Validation helpers
+[![Build Status](https://travis-ci.org/go-openapi/validate.svg?branch=master)](https://travis-ci.org/go-openapi/validate)
+[![Build status](https://ci.appveyor.com/api/projects/status/d6epy6vipueyh5fs/branch/master?svg=true)](https://ci.appveyor.com/project/fredbi/validate/branch/master)
+[![codecov](https://codecov.io/gh/go-openapi/validate/branch/master/graph/badge.svg)](https://codecov.io/gh/go-openapi/validate)
+[![Slack Status](https://slackin.goswagger.io/badge.svg)](https://slackin.goswagger.io)
+[![license](http://img.shields.io/badge/license-Apache%20v2-orange.svg)](https://raw.githubusercontent.com/go-openapi/validate/master/LICENSE)
+[![Go Reference](https://pkg.go.dev/badge/github.com/go-openapi/validate.svg)](https://pkg.go.dev/github.com/go-openapi/validate)
+[![Go Report Card](https://goreportcard.com/badge/github.com/go-openapi/validate)](https://goreportcard.com/report/github.com/go-openapi/validate)
+
+This package provides helpers to validate Swagger 2.0. specification (aka OpenAPI 2.0). 
+
+Reference can be found here: https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md.
+
+## What's inside?
+
+* A validator for Swagger specifications
+* A validator for JSON schemas draft4
+* Helper functions to validate individual values (used by code generated by [go-swagger](https://github.com/go-swagger/go-swagger)).
+  * Required, RequiredNumber, RequiredString
+  * ReadOnly
+  * UniqueItems, MaxItems, MinItems
+  * Enum, EnumCase
+  * Pattern, MinLength, MaxLength
+  * Minimum, Maximum, MultipleOf
+  * FormatOf
+
+[Documentation](https://godoc.org/github.com/go-openapi/validate)
+
+## FAQ
+
+* Does this library support OpenAPI 3?
+
+> No.
+> This package currently only supports OpenAPI 2.0 (aka Swagger 2.0).
+> There is no plan to make it evolve toward supporting OpenAPI 3.x.
+> This [discussion thread](https://github.com/go-openapi/spec/issues/21) relates the full story.
+>
+> An early attempt to support Swagger 3 may be found at: https://github.com/go-openapi/spec3