Acore-server-config

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**Features and Improvements**

- Add support to use AWS S3 as the backend
- Now AWS S3 is the default backend
- Add support to manage game server configuration (the ``*.conf`` file)

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**Bugfixes**

- fix a bug that the key in ``env.servers[${key}]`` should be ``${server_name}``, but not ``${server_id}``.

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**Bugfixes**

- fix a bug that the final AWS parameter name convention should be ``${parameter_name_prefix}${env_name}``, but not ``${parameter_name_prefix}-${env_name}``.

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**Features and Improvements**

- First release
- Allow developer to deploy server configurations in batch to AWS parameter store.
- Allow EC2 instance to auto-discover its configuration from AWS parameter store.
- Add the following public api:
- ``acore_server_config.api.IS_LOCAL``
- ``acore_server_config.api.IS_GITHUB_CI``
- ``acore_server_config.api.IS_EC2``
- ``acore_server_config.api.IS_CODEBUILD_CI``
- ``acore_server_config.api.EnvEnum``
- ``acore_server_config.api.Env``
- ``acore_server_config.api.Config``
- ``acore_server_config.api.Server``
- ``acore_server_config.api.get_server``