Fix rename unique, renaming fields depends on classgraph for searching deep for fields

src/main/java/info/sigterm/deob/Field.java

@@ -62,6 +62,11 @@ public class Field
 	{
 		return accessFlags;
 	}
+	
+	public boolean isStatic()
+	{
+		return (accessFlags & ACC_STATIC) != 0;
+	}
 
 	public String getName()
 	{

src/main/java/info/sigterm/deob/attributes/code/instructions/GetField.java

@@ -82,6 +82,7 @@ public class GetField extends Instruction implements GetFieldInstruction
 			return;
 
 		info.sigterm.deob.Field f2 = cf.findFieldDeep(nat);
+		assert f2 != null;
 		
 		if (f2 == f)
 		{

src/main/java/info/sigterm/deob/attributes/code/instructions/GetStatic.java

@@ -95,6 +95,7 @@ public class GetStatic extends Instruction implements GetFieldInstruction
 			return;
 
 		info.sigterm.deob.Field f2 = cf.findFieldDeep(nat);
+		assert f2 != null;
 		
 		if (f2 == f)
 		{

src/main/java/info/sigterm/deob/deobfuscators/RenameUnique.java

@@ -163,6 +163,8 @@ public class RenameUnique implements Deobfuscator
 		int i = 0;
 		int classes = 0, fields = 0, methods = 0;
 		
+		group.buildClassGraph();
+		
 		for (ClassFile cf : group.getClasses())
 		{
 			if (cf.getName().length() > 2)
@@ -183,8 +185,6 @@ public class RenameUnique implements Deobfuscator
 				++fields;
 			}
 		
-		group.buildClassGraph();
-		
 		// rename methods
 		for (ClassFile cf : group.getClasses())
 			for (Method method : cf.getMethods().getMethods())