Merge Browser and Shell file and script loader paths #800

Job	Run time
Test Build	24s
Test Browser on Linux (firefox, default)	1m 41s
Test Browser on macOS (safari, disabled)	2m 13s
Test Browser on Linux (chrome, disabled)	1m 2s
Test Browser on macOS (safari, main)	59s
Test Browser on Linux (firefox, disabled)	1m 26s
Test Browser on Linux (firefox, main)	58s
Test Shell (spidermonkey, default)	5m 10s
Test Shell (jsc, disabled)	2m 0s
Test Shell (jsc, main)	52s
Test Browser on Linux (chrome, main)	1m 5s
Test Shell (v8, main)	40s
Test Shell (v8, default)	2m 46s
Test Browser on Linux (chrome, default)	1m 10s
Test Shell (spidermonkey, main)	51s
Test Browser on macOS (safari, default)	1m 8s
Test Shell (jsc, default)	3m 3s
Test Shell (spidermonkey, disabled)	1m 54s
Test Shell (v8, disabled)	1m 38s
	31m 0s

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