* Closes#7545 - Support 1Password 1PUX import format based on https://support.1password.com/1pux-format/
* Closes#8367 - Support Bitwarden JSON import format (both unencrypted and encrypted) based on https://bitwarden.com/help/encrypted-export/
* Fixes#9577 - OPVault import when fields have the same name or type
* Introduce the import wizard to handle all import tasks (CSV, KDBX1, OPVault, 1PUX, JSON)
* Clean up CSV parser code to make it much more efficient and easier to read
* Combine all importer tests (except CSV) into one test file
* Update INSTALL.md to align with Wiki
* Add sections for new 2.7.0 features including Quick Unlock, Tags, Browser Integration settings, Auto-Type improvements, etc.
* Update all documentation images to show new interface details
* Expand documentation for database operations
