Set caseSensitive and pathToRegexpOptions defaults on router

[rightaway]

What problem does this feature solve?

caseSensitive and pathToRegexpOptions are set on each of the routes individually, which is redundant and not clean especially when working a very large number of routes and across multiple files. It would simplify the code to be able to set it as a default on the router itself, and each of the routes will inherit that if they don't override it in their own route config.

What does the proposed API look like?

new VueRouter({
  caseSensitive: true,
  pathToRegexpOptions: {},
  routes: [
    { path: '/example', caseSensitive: false, pathToRegexpOptions: {} }
  ]
})