config: use from_json to read ogserver config

This patch introduces the usage of Flask.Config class so the config can
be read at startup (__init__) only once. Config keys must be uppercase
so that from_json method does take it into account.

 dormousehole.readthedocs.io/en/stable/api.html#flask.Config.from_json

Prior to this patch each request required opening and closing the
ogserver.json file via load_config in views.py.

In the future the decorated load_config function inside views.py
may be removed to avoid creating multiple instances of the OGServer
class.

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