(windows) Fixes apache/cordova-plugin-camera#667

[wifisher]

Platforms affected

Windows

Motivation and Context

The plugin was leaving lots of temporary files around in the local root directory. This PR adds code to delete these temporary files.

https://github.com/apache/cordova-plugin-camera/issues/667

Description

The changes are primarily to add calls to deleteAsync() after a file is no longer needed. It cleans up the original captured picture from the camera after that file has been copied or encoded into a base64 string.

It also places the copy made during rescaling into the temporary folder location instead of the local folder.

Testing

I have tested it within my app. Four combinations of options were tested for the getPicture() API:

1. FILE_URI and resize
2. FILE_URI and no resize
3. DATA_URI and resize
4. DATA_URI and no resize.

I also monitored the files stored at the root locations of the local and temporary folder locations to confirm that none of the temporary files were left behind.

Checklist

• [ ] I've run the tests to see all new and existing tests pass
• [ ] I added automated test coverage as appropriate for this change
• [x] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• [x] 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

[wifisher]

Any chance of this PR being merged for the next release?

I think that the Travis issues were test system issues and not issues with these changes. But I'm not sure how to restart the tests.

[breautek]

But I'm not sure how to restart the tests.

I'll restart the tests.

[wifisher]

It looks like the recently run tests completed successfully. It would be nice to have it merged in.

[jcesarmobile]

closing since windows platform has been removed