Scrape dialog

[WithoutPants]

Adds a dialog when scraping scenes and performers that shows the existing and scraped values and allows choosing between them.

Example scene dialog:

Unlike the above image, in general any field that doesn't have scraped values is not shown in the dialog.

Example performer dialog:

This dialog is not shown in the new performers screen - details are piped directly to the fields.

A future iteration on this is to present new tags/performers/studios and allow adding them from this dialog.

Resolves #551
Fixes #646

[peolic]

@WithoutPants
Looks awesome!
I believe I have a bug report:
When you click to apply (I tried Performer - Scene seems to work well),
all the fields that you don't select from the scrape data, even ones that don't show up, get emptied (except maybe the image).
If you click Save, it then saves and displays correct data.

[bnkai]

Can confirm the above bug for the performer edit page.
For the scenes it doesnt seem to detect performers/tags even though they are scraped correctly, their field is empty and they exist in the DB ( i couldn't test movies because of lack of samples).

[WithoutPants]

Fixes #646

[WithoutPants]

Thanks for testing this.

Made a few changes:

• fixed population of performer fields after applying
• scraping dialog now shows existing as the current values, rather than the original values. This means that if you edit the fields before scraping, the dialog will now show those new values, rather than the original values.
• performers/tags are now displayed correctly
• scene URL scrape button is now inline with the URL field, to be consistent with the performer edit page

Ready for retesting.

[peolic]

Retested, looks good!

[peolic]

Noticed one more thing:
Not sure if you want to do this as part of this PR or a separate one,
but the tags show up even if they are the same. Maybe only when more than one tag is matched.
Performers seem to work.

[WithoutPants]

Should be fixed. Wasn't detecting ids in different order.

[peolic]

@WithoutPants Yes, that fixed it.