Ankidroid integration via custom URL scheme

[SpongebobSquamirez]

Related: #18 #19 #20

References:

• https://github.com/ankidroid/Anki-Android/issues/3479
• https://stackoverflow.com/questions/33786651/open-android-app-with-custom-url-scheme

Since there are Anki addons that add J-J definitions, and copying text is useful for (among other things) creating Ankidroid cards, and because switching apps closes the results window, cutting out the middle man and adding Ankidroid integration via a custom url scheme would be extremely helpful.

Desired features:

• Sending entire text to Ankidroid as the "Sentence"
• Sending a screenshot of the text without the result window, possible croppable, to Ankidroid. This can actually just be done by the user before OCR'in, and then they can add most recent screenshot when the card is created, so it's not necessary.
• Sending the 原形/citation/dictionary form of the clicked-on/currently-highlighted word to Anki as the "Expression"
• A definition (using the current dictionary, which is probably at this stage going to be English)
• An option in the settings to specify which fields are actually exported, since different people will want different things.

[0xbad1d3a5]

Linking #26 to keep it in mind.