isSpaceBetween(first, second) {
		return isSpaceBetween(this, first, second, false);
	}
Determines if two nodes or tokens have at least one whitespace character
between them. Order does not matter. Returns false if the given nodes or
tokens overlap.
@param {ASTNode|Token} first The first node or token to check between.
@param {ASTNode|Token} second The second node or token to check between.
@returns {boolean} True if there is a whitespace character between
any of the tokens found between the two given nodes or tokens.
@public