Add support for OpenEdge ABL language

test/fixtures/latex.cls

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+% latex.cls
+%
+% A barebones LaTeX2e class file
+
+\def\author{Abe Voelker}
+\def\fileversion{0.1}
+\NeedsTeXFormat{LaTeX2e}
+

test/fixtures/openedge.cls

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+USING Progress.Lang.*.
+
+CLASS HelloWorld:
+
+  CONSTRUCTOR PUBLIC HelloWorld():
+    SUPER().
+    MESSAGE "Hello, world!".
+  END CONSTRUCTOR.
+
+END CLASS.

test/fixtures/openedge.p

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+MESSAGE "Hello, world!".