What's new

• Toolbox: add seek to character stream method
• UpdateUtils: reverse manifest iterator
• UnitTests: more unit tests
• Updater: remove empty folder from Manifest file

Verification

• Run unit tests
• Enable debug logging
• Update with flash_usb_full and carefully check serial logs especially part when we removing folders
• Review the code

Checklist (For Reviewer)

• [ ] PR has description of feature/bug or link to Confluence/Jira task
• [ ] Description contains actions to verify feature/bugfix
• [ ] I've built this code, uploaded it to the device and verified feature/bugfix

PVS-Studio report for commit 3fc4f501:

• Report

Compiled firmware for commit 669185f2:

• 📦 Update package
• 📥 DFU file
• ☁️ Web/App updater