Fix static callers crashing.

CodeFormatter/src/main/java/org/openzen/zenscript/formatter/ExpressionFormatter.java

 				result.append(".");
 				result.append(operator.operator);
 			}
+		} else if (expression.member.isCaller()) {
+			// nothing
 		} else {
 			result.append(".");
 			result.append(expression.member.getMethodName());

CodeModel/src/main/java/org/openzen/zenscript/codemodel/member/ref/FunctionalMemberRef.java

 		return target.getKind() == FunctionalKind.OPERATOR;
 	}
 	
+	public boolean isCaller() {
+		return target.getKind() == FunctionalKind.CALLER;
+	}
+	
 	public OperatorType getOperator() {
 		return ((OperatorMember) target).operator;
 	}