The viewport should receive events before the world, otherwise all huds will get the events after the world components, if there are any world components underneath them.
This PR adds the following lint rules to our list:
```
always_put_required_named_parameters_first
avoid_multiple_declarations_per_line
avoid_positional_boolean_parameters
avoid_returning_null_for_void
avoid_returning_this
avoid_unnecessary_containers
enable_null_safety
library_private_types_in_public_api
no_leading_underscores_for_library_prefixes
no_leading_underscores_for_local_identifiers
prefer_null_aware_method_calls
tighten_type_of_initializing_formals
unnecessary_late
use_setters_to_change_properties
```
And these rules were considered, and some changes were made according to
them as a clean-up, but in many places they didn't make sense
(`prefer_asserts_with_message` I would have included, but there were too
many places that needed to be changes):
```
collection_methods_unrelated_type
prefer_asserts_with_message
avoid_renaming_method_parameters
```
Created a mixin to handle the margin to the viewport, mostly to remove the code duplication in ButtonComponent and HudButtonComponent, but it can also be useful in other cases when you don't want to wrap your component in HudMarginComponent.
Once the new camera system is in place this will of course have to be replaced.
* Added Component.childrenFactory
* fix some of the lint warnings
* more lint warnings
* remove changelog entry
* more analyzer warnings
* one more warning
* one more warning
* remove more unused imports
* fix more warnings
* another warning
* one more warning
* a lot more warnings
* some more warnings
* fix warnings in flame_svg
* fix warnings in flame_bloc
* Remove OrderedSet override feature
* Remove testRandom change
* Remove unnecessary type checks
* Re-remove deprecated argument in random_test
Co-authored-by: Pasha Stetsenko <stpasha@google.com>
