Allow connection endpoints for list nonterminals

ragconnect.tests/src/test/01-input/list/README.md

ragconnect.tests/src/test/01-input/list/Test.connect

ragconnect.tests/src/test/01-input/list/Test.jadd

ragconnect.tests/src/test/01-input/list/Test.relast

...ect.tests/src/test/01-input/list/TestDependencies.connect

ragconnect.tests/src/test/01-input/singleList/README.md

ragconnect.tests/src/test/01-input/singleList/Test.connect

ragconnect.tests/src/test/01-input/singleList/Test.jadd

ragconnect.tests/src/test/01-input/singleList/Test.relast

...sts/src/test/01-input/singleList/TestDependencies.connect

...nnect.tests/src/test/01-input/singleListVariant/README.md

...ct.tests/src/test/01-input/singleListVariant/Test.connect

...nnect.tests/src/test/01-input/singleListVariant/Test.jadd

...ect.tests/src/test/01-input/singleListVariant/Test.relast

.../test/01-input/singleListVariant/TestDependencies.connect

ragconnect.tests/src/test/01-input/tree/Test.jadd

...nnect.tests/src/test/01-input/treeAllowedTokens/Test.jadd

...t/java/org/jastadd/ragconnect/tests/AbstractMqttTest.java

...src/test/java/org/jastadd/ragconnect/tests/TestUtils.java

...a/org/jastadd/ragconnect/tests/list/AbstractListTest.java