Add test for selecting horizontal whitespace

test/normal/select-horizontal-whitespace/cmd

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+s\h<ret>

test/normal/select-horizontal-whitespace/in

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+Should select all characters to the right of
+the colon except U+000B (vertical tab)
+%(
+U+0009:	
+U+000B:
+U+000C:
+U+0020: 
+U+00A0: 
+U+1680: 
+U+2000: 
+U+2001: 
+U+2002: 
+U+2003: 
+U+2004: 
+U+2005: 
+U+2006: 
+U+2007: 
+U+2008: 
+U+2009: 
+U+200A: 
+U+2028:

+U+2029:

+U+202F: 
+U+205F: 
+U+3000:　
+U+FEFF:
+)

test/normal/select-horizontal-whitespace/kak_quoted_selections

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+'	' '' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
' '
' ' ' ' ' '　' ''