Put labels below transport icons

This prevents the labels from wrapping on small screens. Fixes #191.

See merge request !34

Update dashboard icons when resuming activity.

Fixes #186. 

The issue is that DashboardActivity doesn't receive events while it's paused. This appears to be device-dependent because it depends on the relative speed of resuming the activity vs delivering the event. If the activity resumes quickly enough, it will register its event listener and catch the event. If not, it won't update its icons until it's recreated, e.g. by rotating the screen.

See merge request !31

Switch KDF from SHA-256 to Blake2. #169

The BTP spec calls for Blake2s, but there's no Java implementation available. I suggest we go with Blake2b for now. If it turns out to be a performance bottleneck on 32-bit platforms we can consider implementing Blake2s and merging it upstream.

This depends on !13.

See merge request !21

Stream encryption for BTP version 2. #111

This patch implements the stream header from the BTPv2 spec (https://code.briarproject.org/akwizgran/briar/wikis/BTP).

This merge request depends on !13.

See merge request !18

Longer explanatory text for Tor mobile data setting



See merge request !29

Layout tweaks for ConversationActivity.

Centre the progress wheel and empty list message, hide the empty list message until the list has loaded.

See merge request !26

Replace bluetooth diagram PNG image with vector XML file.

I decided to not use several raster graphics, but use an XML file instead, so the android gradle plugin creates the raster files itself at build-time. I hope that this resolves the problem you saw on that device of yours.

See merge request !30

Show which transports are currently available

Show all transports on the dashboard and indicate which transports are currently available.
The icons have been chosen from the official material icons and might be
replaced later with icons that better represent the given transport.

Please note that I used vector drawables which will be automatically
converted at build time to raster graphics.

See merge request !28

Closes #179

and indicate which transports are currently available.
The icons have been chosen from the official material icons and might be
replaced later with icons that better represent the given transport.

Please note that I used vector drawables which will be automatically
converted at build time to raster graphics.

Closes #96

147 crypto secretbox

Closes #147

See merge request !27

Test vectors taken from NaCl paper.

Use default value of false for Bluetooth setting. #178



See merge request !25