Merge branch 'bugfix/missing-newline-parse-error' into 'develop'

src/main/jastadd/parser/RelAst.parser

src/main/jastadd/scanner/Keywords.flex

src/main/jastadd/scanner/RulesPostamble.flex

src/main/jastadd/scanner/Symbols.flex

src/test/resources/NoWhitespaceAfterRules/config.yaml

src/test/resources/NoWhitespaceAfterRules/in/Grammar.relast

src/test/resources/NoWhitespaceAfterRules/in/Relation.relast