Simplify handling of generated package names in templates further

src/main/java/org/sablecc/sablecc/GenAlts.java

src/main/java/org/sablecc/sablecc/GenAnalyses.java

src/main/java/org/sablecc/sablecc/GenLexer.java

src/main/java/org/sablecc/sablecc/GenParser.java

src/main/java/org/sablecc/sablecc/GenProds.java

src/main/java/org/sablecc/sablecc/GenTokens.java

src/main/java/org/sablecc/sablecc/GenUtils.java

src/main/java/org/sablecc/sablecc/node/Token.java

src/main/resources/org/sablecc/sablecc/alternatives.txt

src/main/resources/org/sablecc/sablecc/analyses.txt

src/main/resources/org/sablecc/sablecc/lexer.txt

src/main/resources/org/sablecc/sablecc/parser.txt

src/main/resources/org/sablecc/sablecc/productions.txt

src/main/resources/org/sablecc/sablecc/tokens.txt

src/main/resources/org/sablecc/sablecc/utils.txt