al-info,gl-info: you fool, printing extension strings all on one line.

Very useless behavior. I always suffered a lot when looking at the
output of --extension-strings. For no reason! It didn't have to be like
that!

src/Magnum/Audio/al-info.cpp

@@ -125,8 +125,10 @@ int main(const int argc, const char** const argv) {
     Debug() << "Current device:" << c.deviceSpecifierString();
 
     if(args.isSet("extension-strings")) {
-        Debug() << "Extension strings:" << Debug::newline
-            << c.extensionStrings();
+        Debug() << "Extension strings:";
+        /* Because printing all extensions on a single line isn't helpful. */
+        for(Containers::StringView e: c.extensionStrings())
+            Debug{} << "   " << e;
         return 0;
     }
 

src/Magnum/Platform/gl-info.cpp

@@ -412,8 +412,12 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     Debug{} << "   " << ", "_s.joinWithoutEmptyParts(c.shadingLanguageVersionStrings());
 
     if(args.isSet("extension-strings")) {
-        Debug{} << "Extension strings:" << Debug::newline
-            << c.extensionStrings();
+        Debug{} << "Extension strings:";
+        /* Because printing 500+ extensions on a single line just *isn't*
+           helpful. For further helpfulness this assumes the driver sorted them
+           (Mesa does). */
+        for(Containers::StringView e: c.extensionStrings())
+            Debug{} << "   " << e;
         return;
     }