[nostalgia,olympic] Replace oxIgnoreError with std::ignore

developer-handbook.md

@@ -222,8 +222,8 @@ int caller2() {
 ```
 
 Lastly, there are a few macros available to help in passing ```ox::Error```s
-back up the call stack, ```oxReturnError```, ```oxThrowError```,
-```oxIgnoreError```, and ```oxRequire```.
+back up the call stack, ```oxReturnError```, ```oxThrowError```, and
+```oxRequire```.
 
 ```oxReturnError``` is by far the more helpful of the two.
 ```oxReturnError``` will return an ```ox::Error``` if it is not 0 and
@@ -232,13 +232,10 @@ Because exceptions are disabled for GBA builds and thus cannot be used in the
 engine, ```oxThrowError``` is  only really useful at the boundary between
 engine libraries and Nostalgia Studio.
 
-```oxIgnoreError``` does what it says, it ignores the error.
 Since ```ox::Error``` is always nodiscard, you must do something with them.
-In extremely rare cases, you may not have anything you can do with them or you
-may know the code will never fail in that particular instance.
-This should be used very sparingly.
-At the time of this writing, it has only been used 4 times in 20,000 lines of
-code.
+In rare cases, you may not have anything you can do with them or you may know
+the code will never fail in that particular instance.
+This should be used sparingly.
 
 
 ```cpp
@@ -257,7 +254,7 @@ ox::Error engineCode() noexcept {
 
 void anyCode() {
     auto [val, err] = foo(1);
-    oxIgnoreError(err);
+    std::ignore = err;
     doStuff(val);
 }
 ```