font_wip branch: new WIP font stuff using "stb_truetype.h",

not implemented for EAN/UPC, not fully tested

backend/tests/data/eps/dbar_omnstk_fh21.eps

@@ -0,0 +1,83 @@
+%!PS-Adobe-3.0 EPSF-3.0
+%%Creator: Zint 2.16.0.9
+%%Title: Zint Generated Symbol
+%%Pages: 0
+%%BoundingBox: 0 0 100 212
+%%EndComments
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+/Helvetica findfont 21 scalefont setfont
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+ (\(01\)09501) stringwidth pop -2 div 0 rmoveto
+ (\(01\)09501) show
+ 50 30.86 moveto
+ (10153000) stringwidth pop -2 div 0 rmoveto
+ (10153000) show
+ 50 6.86 moveto
+ (3) stringwidth pop -2 div 0 rmoveto
+ (3) show