[Indic] Start an Indic shaper

Nothing functional in there yet.

So far, we're parsing IndicSyllabicCategory.txt and IndicMatraCategory.txt
fils from Unicode Character Database and store them in an array to be used
by the shaper.  Also hooked up the shaper, but it does not do anything
right now.
diff --git a/src/Makefile.am b/src/Makefile.am
index 87d0b02..8701d94 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -55,6 +55,8 @@
 	hb-ot-shape.cc \
 	hb-ot-shape-complex-arabic.cc \
 	hb-ot-shape-complex-arabic-table.hh \
+	hb-ot-shape-complex-indic.cc \
+	hb-ot-shape-complex-indic-table.hh \
 	hb-ot-shape-complex-private.hh \
 	hb-ot-shape-private.hh \
 	hb-ot-tag.cc \
@@ -114,6 +116,7 @@
 
 GENERATORS = \
 	gen-arabic-table.py \
+	gen-indic-table.py \
 	$(NULL)
 
 EXTRA_DIST += $(GENERATORS)