detach -> release

The C++ standard library uses the name "release" for the operation we call "detach".

Rewriting each "detach(" to "release(" brings us a step closer to using standard library types directly (e.g. std::unique_ptr instead of SkAutoTDelete).

This was a fairly blind transformation.  There may have been unintentional conversions in here, but it's probably for the best to have everything uniformly say "release".

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1809733002

Review URL: https://codereview.chromium.org/1809733002
diff --git a/src/core/SkRecorder.cpp b/src/core/SkRecorder.cpp
index f9fd8bb..4e23da2 100644
--- a/src/core/SkRecorder.cpp
+++ b/src/core/SkRecorder.cpp
@@ -27,7 +27,7 @@
     for (int i = 0; i < count; ++i) {
         pics[i] = fArray[i]->newPictureSnapshot();
     }
-    return new SkBigPicture::SnapshotArray(pics.detach(), count);
+    return new SkBigPicture::SnapshotArray(pics.release(), count);
 }
 
 void SkDrawableList::append(SkDrawable* drawable) {