v1.7.4

- Regenerated package & example - remove Router class - add maintainS…

…tate to FluroRouter.navigateTo - add transitionDuration to FluroRouter.define - add TransitionType.none - add TransitionType.inFromTop - Pass custom RouteSettings with FluroRouter.navigateTo - basic flutter web support - add FluroRouter.pop result

Rename Router to FluroRouter to avoid collisions with the Router clas…

…s from the new Pages / Navigator 2.0 API

update README and CHANGELOG

fix transition bug. add explicit material transition type. tidy examp…

…le. add font license. remove 'new', 'const', etc where not needed.