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Merge Browser and Shell file and script loader paths #798

Job	Run time
Test Build	25s
Test Browser on macOS (safari, default)	1m 10s
Test Browser on Linux (firefox, default)	1m 8s
Test Browser on Linux (firefox, disabled)	1m 21s
Test Browser on Linux (firefox, main)	54s
Test Browser on Linux (chrome, disabled)	1m 11s
Test Browser on Linux (chrome, main)	36s
Test Browser on macOS (safari, disabled)	1m 32s
Test Browser on macOS (safari, main)	1m 7s
Test Shell (spidermonkey, default)	5m 30s
Test Shell (spidermonkey, main)	49s
Test Shell (jsc, disabled)	1m 46s
Test Shell (v8, main)	40s
Test Browser on Linux (chrome, default)	1m 7s
Test Shell (jsc, default)	3m 5s
Test Shell (jsc, main)	49s
Test Shell (spidermonkey, disabled)	1m 56s
Test Shell (v8, default)	2m 42s
Test Shell (v8, disabled)	1m 36s
	29m 24s