Add experimental ace-echart-utf16 #866

Job	Run time
Test Browser on macOS (safari, default)	1m 15s
Test Browser on Linux (firefox, main)	57s
Test Browser on Linux (firefox, disabled)	1m 18s
Test Shell (jsc, disabled)	1m 7s
Test Shell (v8, main)	25s
Test Shell (jsc, main)	29s
Test Shell (v8, disabled)	1m 39s
Test Shell (jsc, default)	3m 0s
Test Shell (v8, default)	2m 48s
Test Shell (spidermonkey, disabled)	1m 49s
Test Browser on Linux (firefox, default)	1m 32s
Test Browser on Linux (chrome, disabled)	1m 43s
Test Shell (spidermonkey, main)	31s
Test Build	26s
Test Browser on macOS (safari, disabled)	1m 48s
Test Browser on Linux (chrome, main)	1m 27s
Test Browser on Linux (chrome, default)	1m 12s
Test Browser on macOS (safari, main)	1m 7s
Test Shell (spidermonkey, default)	4m 44s
	29m 17s

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