add space recognition

common/spacesUnicode.txt

@@ -0,0 +1,23 @@
+# The space value derives from The Elements of Typographic Style
+# same for en-/em values. Rest are rough guesses.
+space 0020 0.25
+nbspace 00A0 0.25
+# ethi:wordspace 1361 # NOTE: has shape
+enquad 2000 0.5
+emquad 2001 1
+enspace 2002 0.5
+emspace 2003 1
+threeperemspace 2004 3
+fourperemspace 2005 4
+sixperemspace 2006 6
+figurespace 2007 1
+punctuationspace 2008 1
+thinspace 2009 0.1
+hairspace 200A 0.05
+zerowidthspace 200B 0
+narrownobreakspace 202F 0.1
+mediummathematicalspace 205F 1
+cntr:space 2420 0.25
+ideographicspace 3000 1
+# ideographichalffillspace 303F # NOTE: has shape
+zerowidthnobreakspace FEFF 0