Julius Bredemeyer

[BREAKING CHANGE] update to null-safety

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## Description - updated the code to null-safety - updated all dependencies to their latest versions - [BREAKING CHANGE] `WebMapStyleExtension` has been removed in the process due to being removed...

Allow for a custom BypassProxy class to override how a page source is fetched.

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This PR allows custom BypassProxies to also override the way a page is fetched, i.e. via a custom protocol or api. ### Does this PR change anything for users only...

Call onEditorCreated on web after editor was created.

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Fixes #175. With this fix, the `text` value is correctly set as initial data on web as well. It also allows setting a delta in the `onEditorCreated` callback as initial...