[Indic] Add tricky reordering test cases

In the case of Consonant,LeftMatra,Halant, Uniscribe leaves the Halant
where it is, but we want to move it with the Matra as that makes more
logical sense.

test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/MANIFEST

 joiners.txt
 misc.txt
+tricky-reordering.txt

test/shaping/texts/in-tree/shaper-indic/indic/script-devanagari/misc/tricky-reordering.txt

+Usage:
+  ./hb-unicode-encode UNICODE_STRING...
+or:
+  ./hb-unicode-encode --stdin