Bugfix issue 711 heic format

[PieterVanPoyer]

Platforms affected

Android

Motivation and Context

Fixes #711

Description

When a .heic image is selected from a gallery it is converted to a .jpeg or .png image.

A .heic image is a format supported by Samsung phone's to take quality pictures.
But the .heic format cannot be handled by the webview part. (F.e. an image tag does not support it).
So the .heic image is converted by the Android build in HeicConverter.

In the webview part the returned image can be shown in an image tag or it can be send to the server.

Some extra code cleanup is done too.

Testing

Testing in the emulator with next repo: https://github.com/PieterVanPoyer/cordova-camera-plugin-testing-app/tree/features/issue-711-heif-format

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[PieterVanPoyer]

There is a small discussion in the issue log. (see #711 (comment) )
Maybe more formats should be converted to the encodingType of the options.

But I do not like to make such a change right away. Such a change needs a little bit more discussion I think.

[breautek]

looks ok to me