Feature request: add drag zone for OTP token dropdown

[glowinthedark]

General information

• Operating system + version: macOS 0.15.7
• Browser + version: Brave
• Information about the host app:
  • How did you install it? chrome store
  • If installed an official release, put a version ($ browserpass --version):/usr/local/bin/browserpass --version: 3.0.7
• Information about the browser extension:
  • How did you install it? webstore
  • Browserpass extension version as reported by your browser: 3.7.2

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Feature request

Add drag zone to the otp token in the browser dropdown so that the token can be easily dragged into the input field rather than copied and pasted.

Note: it is currently possible to double-click (or select) the token so that it gets selected and then drag the selection but that's the ootb system behaviour and requires a bit of extra knack and effort since the default selection drag zone is too small. Having the entire div containing the token draggable as well as having some drag zone indicator would make the process much easer and avoid the need to use the clipboard.

Examples of a minimal draggable grip handles:

https://codepen.io/zachariab/pen/gOZwPZ https://codepen.io/citylims/pen/ogEoXe