Line-item-manager

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* CLI option to display package version (4)
* Schema invalidation of unrecognized config properties (5)
* Support all bidder keys in config override map (9)

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* FEATURE: prebid recommended size override for banner creatives (1)

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* BUG FIX: multi-line template assignments not parsed correctly (2)

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* Support for including a custom line item priority.

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* Testing: Additional coverage.
* Conditional schema definitions.

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* Added 'Run of network' default inventory targeting
* Added predefined Prebid granularity types
* Dockerfile python change to slim from alpine