Feature Request: Webex support

[surdaft]

Support for Cisco Webex would be great. It does have a chat-bot functionality, basic webhooks are possible but there is an issue when you start adding more and more webhooks. You end up with a new version of the person who created the webhook, with a random ID at the end, so a bot token is just better to use and recommend.

(I plan on looking at adding this, some point this weekend hopefully)

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Notes:

Implement basic webex notification using cards: https://developer.webex.com/buttons-and-cards-designer

webex://bot-token@room-id

Likely copy/paste of discord, where custom JSON payload can be used if wanted. Allowing for more complex card structures if you want, or a basic markdown message.