Fix fontawesome4 less and some imperfection of #1119 #1212
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Already merged PR #1119 is not perfect in following points.
font-awesome4
directory,spinning.less
is deleted butfont-awesome.less
still depends onspinning.less
.font-awesome
directory,font-awesome.less
no longer depends onspinning.less
butspinning.less
file still exists.This PR fixes these. Thanks.