Miscellaneous fixes for Preview Release - Part 2

Merge branch 'preview-misc-fixes-2' of https://git.atmire.com/contributions/dspace-angular into preview-misc-fixes-2

replace npm variable with dedicated script to run webpack with a larger heapspace. The variables didn't work cross-platform

fix an issue where the state of an aggregated RD would be wrong when some of the RDs it's based on were still pending

[DS-4236] fix issues with collection recent submissions

fix an issue where the recent submissions on collection homepages would be wrong, and would continually rerender

Miscellaneous fixes

Adding Configurable "Entities" to DSpace 7 (Part 1: Search/Browse, Display)

[Configurable Entities] final master merge