Add getRecommendedShards and automatic shard count in ShardingManager (#796)

* draft stuff

fix docstring for Client#token

Reorganise resolver

make env better for shards, clean up docs

Fix Gus' log messages

7

meh just gateway/bot not v7 :(

final changes, ready for mergin!

build docs

make default totalShards 'auto', fix docs for totalShards type

clean up docs more

run docs

* make consistancy real

* Update and rename getRecommendedShards.js to GetRecommendedShards.js

* Update GetRecommendedShards.js

* Update index.js

* Update RESTMethods.js

* Update Shard.js

* Update GetRecommendedShards.js

* Update ShardingManager.js

* run docs

src/util/Constants.js

@@ -72,6 +72,7 @@ const Endpoints = exports.Endpoints = {
   login: `${API}/auth/login`,
   logout: `${API}/auth/logout`,
   gateway: `${API}/gateway`,
+  botGateway: `${API}/gateway/bot`,
   invite: (id) => `${API}/invite/${id}`,
   inviteLink: (id) => `https://discord.gg/${id}`,
   CDN: 'https://cdn.discordapp.com',