This PR merges the functionality of SnippetTemplate.Arguments.addConst() into SnippetTemplate.Arguments.add().
I have stumbled into errors before due to mistakenly calling add() instead of addConst(). The changes in this PR should prevent that from happening in the future.
addVarargs() is still left unchanged, since that one has a much different usage pattern, so it's not really possible to confuse it with add().
This PR merges the functionality of SnippetTemplate.Arguments.addConst() into SnippetTemplate.Arguments.add(). I have stumbled into errors before due to mistakenly calling add() instead of addConst(). The changes in this PR should prevent that from happening in the future. addVarargs() is still left unchanged, since that one has a much different usage pattern, so it's not really possible to confuse it with add().