tokens: ACKNOWLEDGEMENTS MBK and AF acknowledge support from NSF grant AST-1517226. MBK was also partially supported by NASA grants NNX17AG29G and HST -AR-13888, HST -AR-13896, HST -AR-14282, HST -AR-14554, HST -GO-12914, and HST -GO-14191 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. KNA is supported by NSF Theoretical Physics Grant No. PHY-1620638. DK was supported by NSF grant AST-1715101 and the Cottrell Scholar Award from the Research Corporation for Science Advancement. Support for SGK was provided by NASA through Einstein Postdoctoral Fellowship grant number PF5-160136 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060. CAFG was supported by NSF through grants AST-1412836, AST-1517491, AST-1715216, and CAREER award AST-1652522, by NASA through grant NNX15AB22G, and by a Cottrell Scholar Award from the Research Corporation for Science Advancement.
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