add optional ImageUpload for Webhook (#3174)

* WIP add Webhook

* fix config html for webhook
add tooltips for webhook

* webhook: fix not enabling webhook

* send webhook as json

* Update ApiKey.md

* webhook: fix only sending last "Number"

* webhook JSON is now closer to the data log in CSV format

* webhook: add img upload

* webhoop added config for imgupload

* webhook html fixes

* webhook: drop timeStampTimeUTC and switch from timeStamp to lastvalue like lokal csv to fix no timestamp on error

* add checkbox for Webhook_UploadImg

* Update sd-card/html/edit_config_template.html

* Update edit_config_template.html

* Update edit_config_template.html

* Update edit_config_template.html

* added a long timestamp to both webhook requests

---------

Co-authored-by: CaCO3 <caco3@ruinelli.ch>

param-docs/parameter-pages/Webhook/UploadImg.md

@@ -0,0 +1,8 @@
+# Parameter `UploadImg`
+Default Value: `0` (`NEVER`)
+
+Available options:
+
+- `0`: `NEVER`
+- `1`: `ALWAYS`
+- `2`: `ON_ERROR`