feat(gateway/REST): V10 API changes

[coolcalcacol]

Re-created due to github being github

Breaking

• getActiveThreads has been removed, as the endpoint is no longer available

Additions

• messageContent intent added
• all and allPrivileged types and bit fields updated

Changes

• Gateway/REST version 9 -> 10
• application.summary type changed from string to explicit ""

TODO:

• document attachments changes, if anyone cares
• check if achievements are actually cared about

[DonovanDMC]

If all the current changes are present, LGTM

[frobinsonj]

https://discord.com/developers/docs/change-log#api-v10

To specify a reason for an administrative action in audit logs, apps must now pass the X-Audit-Log-Reason header rather than the reason parameter for all endpoints.

The following should exception should probably be removed:

eris/lib/rest/RequestHandler.js

Line 104 in 4ea56e4

if((method !== "PUT" || !url.includes("/bans")) && (method !== "POST" || !url.includes("/prune"))) {

[bsian03]

Not doing attachments since Game SDK is out of scope within Eris. Attachment changes were already documented in the previous PR