test(package): Add test for dropcaps package

tests/dropcaps.expected

@@ -0,0 +1,51 @@
+Set paper size 	297.6377985	419.5275636
+Begin page
+Mx 	55.5086
+My 	39.8973
+Mx 	14.8819
+My 	69.8973
+Set font 	Gentium Plus;73.7619;400;;normal;;;LTR
+T	55 w=40.6267	(T)
+Mx 	55.5086
+My 	39.8973
+Set font 	Gentium Plus;25;400;;normal;;;LTR
+T	72 86 87 76 81 74 w=62.5732	(esting)
+Mx 	127.0178
+T	82 81 72 w=37.9150	(one)
+Mx 	173.8688
+T	87 90 82 w=38.8306	(two)
+Mx 	221.6353
+T	87 75 85 72 72 w=55.3955	(three)
+Mx 	277.0308
+T	15 w=5.7251	(,)
+Mx 	55.5086
+My 	69.8973
+T	71 82 81 10 87 w=54.2236	(don't)
+Mx 	116.5563
+T	70 82 79 79 76 71 72 w=68.3716	(collide)
+Mx 	191.7521
+T	90 76 87 75 w=46.8262	(with)
+Mx 	245.4024
+T	80 72 w=31.6284	(me)
+Mx 	277.0308
+T	17 w=5.7251	(.)
+Mx 	14.8819
+My 	99.8973
+T	41 82 88 85 w=47.6685	(Four)
+Mx 	71.3523
+T	737 89 72 w=38.4277	(five)
+Mx 	118.5821
+T	86 76 91 w=29.0039	(six)
+Mx 	147.5860
+T	15 w=5.7251	(,)
+Mx 	162.1131
+T	81 82 w=26.3672	(no)
+Mx 	197.2823
+T	70 85 82 86 86 76 81 74 w=85.4736	(crossing)
+Mx 	14.8819
+My 	129.8973
+T	86 87 76 70 78 86 w=57.8125	(sticks)
+Mx 	72.6944
+T	17 w=5.7251	(.)
+End page
+Finish

tests/dropcaps.sil

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+\begin[papersize=a6]{document}
+\nofolios
+\script[src=packages/dropcaps]
+\font[size=25pt]
+\dropcap[lines=2]{T}esting one two three, don't collide with me.
+Four five six, no crossing sticks.
+\end{document}