Add ability for runtime to store arbitrary options/metadata
Add ability for runtime to store arbitrary options/metadata

4eek/XBlock,edx-solutions/XBlock,edx/XBlock,nagyistoce/edx-XBlock,edx-solutions/XBlock,4eek/XBlock,mitodl/XBlock,lovehhf/XBlock,mitodl/XBlock,nagyistoce/edx-XBlock,open-craft/XBlock,EDUlib/XBlock,edx/XBlock,lovehhf/XBlock,EDUlib/XBlock,open-craft/XBlock