Extend loader to accept possible initrd per platform#5

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Dreaded-Gnu wants to merge 8 commits intobolthur:developfrom

Dreaded-Gnu:develop

Commits on Jul 9, 2019

Commits on Sep 30, 2019

- Added initrd load address define within host macro
Dreaded-Gnu
committed

Commits on Oct 19, 2019

Commits on Oct 20, 2019

- Changed output file ending to elf
Dreaded-Gnu
committed

Commits on Apr 27, 2020