Renames Router to ModularRouter to avoid conflicts with Flutter

[phackwer]

Renaming the Router from Modular to ModularRouter seems to be a better and more definitive strategy than hiding the official Flutter Router from Modular package. Eventually a project may be using both classes or add a package that uses the official one for adding routes and this could cause a bigger problem in the long term or create resistance from other developers to use Modular package as it has internal conflicts with naming from official Flutter.

After this change, the only code adjustment that had to be done in projects using modular package was to replace matching case the class Router by ModularRouter. Code worked without any further changes.

Command bellow replaces all Router calls by ModularRouter easily:

egrep -lRZ 'Router' . | xargs -0 -l sed -i -e 's/Router/ModularRouter/g'

Pubspec change to test it:

  flutter_modular:
    git:
      url: https://github.com/4CME/modular
      path: flutter_modular

Since this is an API change and I also would recommend a new version release as defined in the semver.org standard.