Web Camera - use file input

[mlynch]

This PR adds support for the native file input method for picking/taking a photo. This makes it possible to select a photo from the filesystem or use the native prompt provided on mobile.

Because this experience is likely a bit closer to what users would expect on mobile/desktop browsers, I've also changed the default so that the PWA Elements system is opt-in instead of the default if installed. Technically, this is a breaking change, but I don't think it warrants a major release.

[mlynch]

I need to do one more thing: hide the input so it doesn't mess w/ any UI.

[jcesarmobile]

I think you can’t click it if hidden, but you can probably use absolute position to put it outside of the visible area

[jcesarmobile]

Added a few comments

[aaronksaunders]

when will this be merged?

[rdlabo]

This is great function . I looks forward to merge this🎉

[bijanmmarkes]

When will this be merged? 👍 @mlynch

[rdlabo]

I noticed that iOS Safari may not work input of createElement...
: https://stackoverflow.com/questions/47664777/javascript-file-input-onchange-not-working-ios-safari-only

User must prepare real DOM in index.html.

<div style="width: 0; height: 0; overflow: hidden;">
  <input id="browserPhotoUploader" type="file" accept="image/*" />
</div>

I think this is not smart. Is there any good way?

[alexcroox]

Any movement on this 10 month PR? I'd like to use file input for both web and native app.

[mlynch]

Alright this is updated, working, and ready for review

[imhoffd]

Looks good! @jcesarmobile want to approve?

[jcesarmobile]

Added two comments.

Also, CameraDirection description says it's iOS only, but this PR seems to add support for web, so should be mentioned.

[jcesarmobile]

You missed my comment about CameraDirection, I've added that information in a new commit.

Using the input as default will "break" apps that already configured and use pwa-elements, so the default behavior should be changed or the PR should be sent to v3 branch.

[jcesarmobile]

looks good to me