app protocol links + semihelpful refresh

[0x70b1a5]

Problem

1. feature: links to other apps #811
2. hitting Refresh on an open app closes the app

Solution

1. implement feature: links to other apps #811
2. read the #url-hash if present to attempt to find an app to open on refresh

Testing

#811

• open the Appstore Widget. Click a listing - they use hw:// links now.
• Verify the app listing click opens the appstore page of the respective app.
• Without closing the appstore, proceed immediately to the next set of tests.

Reloads

• Hit Refresh, CTRL+R or F5.
• Verify that the appstore reopens to the main appstore page on the page reload. (sub-page nav is something i'd like to add later on if needed - it's possible for the appstore we have but it may not be desired in the fully general case of all webapps.)

[nick1udwig]

Really nice work

I have a small nit for you to look at before merge:

• Click an app in widget
• App Store properly opens to that app's page
• Click to go to App Store home
• Click action button and go to home screen (leaving App Store open on the home page)
• Click on an app in widget
• App Store opens, but not to the app's page: instead just to the homepage

Is this intended or expected behavior? Is it easy to fix?

[0x70b1a5]

@nick1udwig It should work now. There's a trade-off here where I believe the issue is:

• the homepage only has control over the iframe's top-level src attr
• the homepage does NOT have the ability to manipulate child SPA paths js-wise
  • such a thing could be done, but it'd involve more iframe message passing and hw:// library updates
• anyway, changing this src attr does indeed "navigate" the iframe (by causing it to entirely reload)
• this results in a slow, but adequate, completion of the desired action

I vote "make it exist first, make it good later" here, personally. If we need lightning fast intra-app switching via external link clicks, it might be better to put the work into it once there is a solid user story informed by the need.

[nick1udwig]

@0x70b1a5 not going to hold up the PR on this, but there is still one edge case, see #843