R-TrustTunnel 0.6.0

Release notes, verified checks and known limitations: https://github.com/onixus/Rust-trustvpn/blob/cbd50aa217049f0d7bff28350fae34a2ed55d12c/docs/releases/v0.6.0.md — Windows installer is not Authenticode-signed; macOS packages are ad-hoc signed (no automatic updates on macOS).

Android APK: 0.6.0-preview.2 (versionCode 60002), built after the tag from main 4cbff53 (#63, #64; source manifest rtrust-android-0.6.0-preview.2-source-manifest.json). It keeps the VPN on the current network after Wi-Fi/mobile handoffs, recovers an Always-on session switched on in Settings, and adds Settings -> VPN data usage. Signed with a NEW key: certificate SHA-256 4aa431cd89387e969da006b0a76288ac725fa17e952a83641df80d4b977306af. It updates 0.6.0-preview.1 installs in place, but cannot update installations from v0.5.0 or earlier (signed with 74b16206...b21b1b95): uninstall the old app first; profiles and Keystore credentials are not carried over. Release notes for the APK: https://github.com/onixus/Rust-trustvpn/blob/4cbff53/docs/releases/v0.6.0.md#android