* add request_internet_access manifest option
* test request_internet_access
* update CHANGELOG
* force warning when internet access is enabled
if internet access is enabled,
show a warning instead of the normal summary
(the internet access is currently mainly to test out integrations
as maps for video chat; the summary is dispensable in the cases currently)
* adapt json-rpc's WebxdcMessageInfo
* add min_api to manifest.toml, define WEBXDC_API_VERSION
* return an error instead of index.html if the webxdc requires a newer api
* add a test with an webxdc requiring a newer api
* update CHANGELOG
* let sending invalid webxdc fail
invalid webxdc can still be send as Viewtype::File, however
(maybe one want to discuss errors or so ;)
* clarify the supported zip compression methods
