[skip ci] Updated licenses and gitignores

options/license/ANTLR-PD-fallback

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+ANTLR 2 License
+
+We reserve no legal rights to the ANTLR--it is fully in the public domain.
+An individual or company may do whatever they wish with source code distributed
+with ANTLR or the code generated by ANTLR, including the incorporation of
+ANTLR, or its output, into commerical software.
+
+We encourage users to develop software with ANTLR. However, we do ask that
+credit is given to us for developing ANTLR. By "credit", we mean that if you
+use ANTLR or incorporate any source code into one of your programs (commercial
+product, research project, or otherwise) that you acknowledge this fact somewhere
+in the documentation, research report, etc... If you like ANTLR and have developed
+a nice tool with the output, please mention that you developed it using ANTLR.
+In addition, we ask that the headers remain intact in our source code. As
+long as these guidelines are kept, we expect to continue enhancing this system
+and expect to make other tools available as they are completed.
+
+In countries where the Public Domain status of the work may not be valid,
+the author grants a copyright licence to the general public to deal in the
+work without restriction and permission to sublicence derivates under the
+terms of any (OSI approved) Open Source licence.