Temporarily remove the Option and Result implementations (FuelLabs#63)

* fix:temp removal of result & option implementations

* fix:remove option & result from lib.sw

* fix:remove import of Result & change return type of msg_sender temporarily

src/chain/auth.sw

@@ -1,7 +1,6 @@
 library auth;
 //! Functionality for determining who is calling an ABI method
 
-use ::result::Result;
 use ::address::Address;
 use ::contract_id::ContractId;
 
@@ -24,18 +23,19 @@ pub fn caller_is_external() -> bool {
 }
 
 /// Get the `Sender` (ie: `Address`| ContractId) from which a call was made.
-/// Returns a Result::Ok(Sender) or Result::Error.
-// NOTE: Currently only returns Result::Ok variant if the parent context is Internal.
-pub fn msg_sender() -> Result<Sender, AuthError> {
+/// TODO: Return a Result::Ok(Sender) or Result::Error.
+pub fn msg_sender() -> b256 {
     if caller_is_external() {
         // TODO: Add call to get_coins_owner() here when implemented,
-        Result::Err(AuthError::ContextError)
+        // Result::Err(AuthError::ContextError)
+        0x0000000000000000000000000000000000000000000000000000000000000000
     } else {
         // Get caller's contract ID
         let id = ~ContractId::from(asm(r1) {
             gm r1 i2;
             r1: b256
         });
-        Result::Ok(Sender::Id(id))
+        // Result::Ok(Sender::Id(id))
+        id.value
     }
 }

src/lib.sw

@@ -1,6 +1,5 @@
 library std;
 
-dep result;
 dep hash;
 dep storage;
 dep constants;
@@ -9,7 +8,6 @@ dep address;
 dep contract_id;
 dep chain;
 dep context;
-dep option;
 dep math;
 dep block;
 dep token;