WIP feat: Allow for packages to be dynamically loaded in app #888

Job	Run time
website / pkgdown	2m 54s
R-CMD-check / setup	49s
routine / routine	2m 13s
R-CMD-check / macOS-latest (4.4.2)	3m 41s
R-CMD-check / windows-latest (devel)	7m 37s
R-CMD-check / windows-latest (4.4.2)	5m 56s
R-CMD-check / windows-latest (4.3)	9m 40s
R-CMD-check / windows-latest (4.2)	10m 52s
R-CMD-check / windows-latest (4.1)	10m 35s
R-CMD-check / windows-latest (3.6)	7m 55s
R-CMD-check / ubuntu-latest (devel)	3m 56s
R-CMD-check / ubuntu-latest (4.4.2)	3m 21s
R-CMD-check / ubuntu-latest (4.3.3)	6m 20s
R-CMD-check / ubuntu-latest (4.2.3)	4m 16s
R-CMD-check / ubuntu-latest (4.1.3)	4m 10s
R-CMD-check / ubuntu-latest (4.0.5)	3m 54s
	1h 28m 9s

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