lib/error: Add ErrorOrVoid

This allows for error propagation on functions that would otherwise
not return anything.

src/lib/error.hpp

@@ -46,8 +46,20 @@ struct ErrorOr {
     }
 };
 
+struct ErrorOrVoid {
+    bool isError;
+    uint8_t errorCode;
 
+    ErrorOrVoid() {
+        this->isError = false;
+        this->errorCode = 0;
+    }
 
+    ErrorOrVoid(bool isError, uint8_t errorCode) {
+        this->isError = isError;
+        this->errorCode = errorCode;
+    }
+};
 
 namespace ErrorCodes {
     // These are all arbitrary values used to assign error codes to different