Provide the PathLocationStrategy in development mode

[StefanRein]

Short description of what this resolves:

With --pathlocationstrategy e.g. npm run ionic-app-scripts serve --pathlocationstrategy you can now use the PathLocationStrategy. This means you can refresh on a route like this: http://localhost:8100/dashboard/my-feature without a server error and loading the correct view of the route without the need to open http://localhost:8100/#/dashboard/my-feature with the HashLocationStrategy.

Changes proposed in this pull request:

• Add a command line flag for enabling the PathLocationStrategy in development mode.
• If this flag is enabled, reroute any requests to serveIndex => e.g. index.html

Fixes: #10565

[StefanRein]

Also fixes this on local development: ionic-team/ionic-framework#10565

[StefanRein]

@danbucholtz

[StefanRein]

Ok discovered a resulting bug:

He can not load: ion-dev.js and the ion-dev.css

I'll look into this and commit a fix.

[StefanRein]

Just needed to inject the dev logger script absolute now.

[StefanRein]

I did experience an issue with <base href="/">.
Additionally it will be broken on a document.location.reload() call, because the running server in app does not reroute to index.html.

[Kawzeg]

This breaks proxies, because setupProxies sets up the proxies asynchronously.

[arimus]

So...any word on a fix / new merge for path location support? Or is there any way to resolve that doesn't involve manually editing node_modules files?