v1.10.0-beta.1

Media Gallery showing all attachments in a given conversation (#2291, previously #2236)

Note: Until all attachments have been migrated to disk (as part of a background process), only a partial set of a conversation's media will show up, skewed towards the most recent messages

Quotes:

• Show 'You' in Android theme instead of your own contact name (#2312)
• Show thumbnails for quotes of messages with video attachments (#2293)

Video attachments: show first frame preview in composition area (#2293)

Increase speed of migration to move attachments to disk from database (#2314)

Dev:

• Add comments clarifying our mechanisms for stripping EXIF info (#2313)
• Move to prettierjs to format our code (#2303)
• Fix break in styleguide; make filesize/Signal.Util.GoogleChrome available (#2302)
• Remove duplicate entry from .gitignore (#2271)