refactor: new data/ structure

data/source/carrier/decoder/plain_1.c

@@ -0,0 +1,3 @@
+    for (int n=0; n<{{PAYLOAD_LEN}}; n++) {
+        dest[n] = supermega_payload[n];
+    }

data/source/carrier/decoder/xor_1.c

@@ -0,0 +1,5 @@
+    // Single byte XOR key
+    for (int n=0; n<{{PAYLOAD_LEN}}; n++){
+        dest[n] = supermega_payload[n];
+        dest[n] = dest[n] ^ {{XOR_KEY}};
+    }

data/source/carrier/decoder/xor_2.c

@@ -0,0 +1,5 @@
+        // Multibyte XOR (untested)
+        // Need: key, key_len
+        for ( int i = 0; i < {{PAYLOAD_LEN}}; i++ ) {
+            dest[i] = supermega_payload[i] ^ key[i % key_len];
+        }