message: [sql_db_plugin] plugin not REQUIRED
diff: -find_package(Soci REQUIRED)
  +find_package(Soci)
  +if(NOT SOCI_FOUND)
  + message(STATUS "Database SQL plugin: disabled")
  + return()
  +endif()
  +
  +message(STATUS "Database SQL plugin: enabled")
  include_directories(${CMAKE_CURRENT_SOURCE_DIR} include db)
  