Move drone into its own crate

sdk/src/system_instruction.rs

@@ -0,0 +1,28 @@
+use pubkey::Pubkey;
+
+pub const SYSTEM_PROGRAM_ID: [u8; 32] = [0u8; 32];
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub enum SystemInstruction {
+    /// Create a new account
+    /// * Transaction::keys[0] - source
+    /// * Transaction::keys[1] - new account key
+    /// * tokens - number of tokens to transfer to the new account
+    /// * space - memory to allocate if greater then zero
+    /// * program_id - the program id of the new account
+    CreateAccount {
+        tokens: u64,
+        space: u64,
+        program_id: Pubkey,
+    },
+    /// Assign account to a program
+    /// * Transaction::keys[0] - account to assign
+    Assign { program_id: Pubkey },
+    /// Move tokens
+    /// * Transaction::keys[0] - source
+    /// * Transaction::keys[1] - destination
+    Move { tokens: u64 },
+
+    /// Spawn a new program from an account
+    Spawn,
+}