Merge branch '3.1'
- Conflicts:
- cmake/modules/FindICU.cmake
- src/drivers/mysql/kdb_mysqldriver.json
- src/drivers/postgresql/kdb_postgresqldriver.json
- src/drivers/sqlite/kdb_sqlitedriver.json
- src/drivers/sybase/kdb_sybasedriver.json
- src/drivers/xbase/kdb_xbasedriver.json