Support for Discord forum channels

[Uwe4Waze]

Fixes #122

Proposed changes in this pull request:

• Discord: supporting Forum channel

• Discord: auto-detecting channel type (Text channel/Forum channel)

• Discord: slack-compatible Webhook URLs remain supported; no database changes needed

• Discord: slightly changed request format

• Discord: added signature to request to identify script

• [x] PR as been tested

• [x] Don't send big changes all at once. Split up big PRs into multiple smaller PRs that are easier to manage and review

• [x] Read contribution guide

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This change is 

[GyllieGyllie]

Hey @Uwe4Waze,

I've been looking over this code again and wonder if we need the auto detect for channel type or if we can just add it into the data that holds the webhooks anyways. This way it's less prone to issues with the auto detection logic.

Open to hear what you think.

[Uwe4Waze]

Hi @GyllieGyllie, of course we can add the channel type information to the database structure. To get this information, you need to ask the community admins if they are still using the script with text channels or if they have switched to forum channels in the meantime and therefore do not (cannot) use the script at the moment. The latter is the case for Germany, for example. If a community is planning to change the channel type, this must be coordinated in order to provide an adapted WMESTSData.js in a timely manner. Greetings Uwe

[sonarcloud[bot]]

Quality Gate passed

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0 New issues

Measures
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See analysis details on SonarCloud

[GyllieGyllie]

I will merge it as is for now so it at least works again while we look into the other option