HickelSOFT RustDesk Custom Client

This special build is only for use by HickelSOFT customers.

Changes:

• Converted submodule libs/hbb_common into the main codebase.
• Builds only for Win32 and Win64, only encrypted 7-Zip (Changed file: .github/workflows/flutter-build.yml, Repository secret RELEASE_PASSWORD)
• Build only on demand, not nightly (Changed file: .github/workflows/flutter-nightly.yml).
• Added HickelSOFT logo (Changed files: .gitignore, flutter/assets/logo_dark.png, flutter/assets/logo_light.png)
• Removed "sad smiley" for empty peers list, since it confuses customers (Changed file: flutter/lib/common/widgets/peers_view.dart)
• Replaced update service with our own, including HMAC verification of the downloaded file, and removed transmission of unnecessary machine metadata to the update server (Changed files: cargo.toml, cargo.lock, flutter/lib/desktop/pages/desktop_home_page.dart, src/ui/index.tis, src/updater_rs, src/flutter_ffi.rs, libs/hbb_common/src/lib.rs, src/common.rs, .github/workflows/flutter-build.yml, Repository secret UPDATER_HMAC_SECRET)
• Desktop setting page: Added note about customizations and custom server in the About page. (Changed file: flutter/lib/desktop/pages/desktop_setting_page.dart)
• Install page: Desktop icon is default false, because HickelSOFT has own Desktop icon (Changed file: flutter/lib/desktop/pages/install_page.dart)
• Silent install: Desktop icon and RustDesk Printer is default false (reason: HickelSOFT has own Desktop icon) and install printer is also default false (reason: Rarely used) (Changed file: src/core_main.rs)
• Reactivate RENDEZVOUS_SERVER, API_SERVER, RS_PUB_KEY secrets for custom client, otherwise we cannot have a custom client anymore; Connection data as part of the filename is ugly and insecure.
  • Undo "reduce the convenience" (Changed file: libs/hbb_common/src/config.rs)
  • Undo rustdesk#13959 (Changed file: src/common.rs)
• Changed default display settings to show remote cursor by default, having adaptive display by default, show monitors in toolbar by default, and disable audio by default (Changed file: libs/hbb_common/src/config.rs)
• Changed this README.md file (Changed file: README.md)
• Token is not transmitted to HBB anymore, since API and HBB are distinct for us, and the token should not be transmitted unencrypted. (Changed file: src/client.rs)
• Disabled secure_tcp, because our server does not support KeyExchange. (Changed file: src/common.rs)
• Change some German texts for HickelSOFT (Changed file: src/lang/de.rs)