d2j-predict: auto clean up the string encryption and reflection by d3xguard

[pxb1988]

the d2j-decrypt-string.sh can decrypt the d3xguard's earlier static String decrypt(III) style string encryption.

but the later version of d3xguard generate with a more complex pattern. and combine with the java reflection, the code looks like shit.

static byte[] array= { ... };
void amethod(){
    //...
    String str = decrypt(array[5] ^ 3, 5, 3);
    //...
}