Lighten the icons to work with the dark theme
Generate the QR image with white background
Make key view use the theme background
Make purple resource appear as blue
Fix legacy mode for K9
Update bc submodule
Update AndroidManifest, add ViewCertActivity
Fix theme
Always hide the revoked key icon

It isn't a key capability like certify, encrypt, sign,
and it's redundant, since the key is crossed out.