Remove all SQLite server dependencies

[lanedirt]

#190 has switched the previous SQLite server database setup to PostgreSQL to fix concurrency issues. Because of supporting migrations the version 0.10.0 contains support for both SQLite and PostgreSQL.

To simplify the code logic all SQLite server dependencies can be removed in a future version starting with 0.11.0. Todo:

• Remove SQLite migrations from AliasServerDb project
• Remove SQLite packages
• Remove SQLite db factories
• Refactor AliasServerDb interfaces/factories to separate folders for clear separation of models and other classes
• Remove all sqlite appsettings references
• Update docs to include mention that if updating from <= 0.9.x you first need to update to 0.10.x, and afterwards update to 0.11.x. Sanity check if this is possible at all: can we do ./install.sh update to a specific version and will it also download the installer of that specific version? If this is not possible right now we might need to postpone deleting sqlite until the new major version 1.0.