explorer service and network menu as sidebar in explorer; next step componizing of network and sidebar such that it can be applied easily to analysis

edges in analysis network; handdling of node labels, replacing by chosen identifier if unset instead of netexId; handling of multiple ensg numbers for same node missing

added customwebpack as builder; added postcss to add style selector; shadowed necessary styles; switched to other fontawesome angular implementation

display drugs and nodes in analysis network; display custom nodes like patients; TODO: node type is not passed on from group AND node style in analysis is not loaded correctly, falls back to default.+