Store database key in a file

Closes #1219

See merge request akwizgran/briar!810

Introduction: Reset session information for removed introducees

Closes #1281

See merge request akwizgran/briar!813

Escape Unicode characters in test data

See merge request akwizgran/briar!812

This enables reproducible builds with non-Unicode locales.

Make build timestamp command compatible with old versions of Git

See merge request akwizgran/briar!811

Switch to our own CI image

See merge request akwizgran/briar!809

Hide testing preferences in release builds

See merge request akwizgran/briar!808

Add CI stage for testing reproducibility

See merge request akwizgran/briar!807

Use lower default limit for BDF strings and raws

Closes #1277

See merge request akwizgran/briar!805

Use more realistic LAN addresses for test contacts

See merge request akwizgran/briar!804

Decouple DevReportSender from TorPlugin

See merge request akwizgran/briar!803

Use internal log handler for crash reports and feedback

Closes #986

See merge request akwizgran/briar!802

Refactor MessageEncrypter main method

See merge request akwizgran/briar!800

Add crash button to UI in debug mode

See merge request akwizgran/briar!801

Silence known strict mode violations

See merge request akwizgran/briar!795

Use lighter text colour for preference categories and fix layout

See merge request akwizgran/briar!799

Remove support for unbound transport keys

See merge request akwizgran/briar!791