Problem/Motivation
The views plugin argument for string values has some SQLite and PostgreSQL specific code. All specific code for a particular database should be moved to the module that is providing the database driver for the given database.
Proposed resolution
Move the SQLite and PostgreSQL code from the Views StringArgument to the sqlite and pgsql module
Remaining tasks
TBD
User interface changes
None
API changes
None
Data model changes
None
Release notes snippet
None