Enhance filtercell with namespace and rework some filtering technical debt

[zsinnema]

See also #378

feature: enhance FilterCell with namespace so it can set/get the value via the filteringservice with the namespace via the filtername.

tech debt: cleanup/remove filtering code in the components (e.g.

geppetto-scidash/components/scores/Scores.js

Line 61 in 960eb62

FilteringService.getInstance().setFromGLobalFilters( this.props.onFilterUpdate);

)

tech debt: rework getNamespaceFromKey (

geppetto-scidash/shared/Helper.js

Line 141 in 960eb62

static getNamespaceFromKey (key, namespace) {

) remove hardcoded key names