forked from loafle/openapi-generator-original
* [dart] Improve types & imports * don't use importMapping as it is intended for something different that is not possible in dart * introduce imports map for dart specific features * always import `dart:core` * get rid of additionalReservedWords * fix `--type-mappings` not working * use required type mappings in samples * no longer define additional reserved words as it is impossible to list all anyways, they can now be configured via type-mapping parameter * simplify dio imports * Don't use guava for map instantiation * Update docs