Rename googledatalogger to GoogleDataTransport (#2379)

* Rename GoogleDataLogger to GoogleDataTransport

All files should be renamed, GDL prefixes should now be GDT.

* Remove references to logging and replace with notion of 'transporting'

* Style, and cleaning up a few more references

Author: mikehaney24

.travis.yml

@@ -112,15 +112,15 @@ jobs:
         # The travis_wait is necessary because the command takes more than 10 minutes.
         - travis_wait 45 ./scripts/if_cron.sh ./scripts/pod_lib_lint.sh FirebaseFirestore.podspec --use-libraries --allow-warnings --no-subspecs
 
-    # GoogleDataLogger unit tests and pod linting using the default Xcode version.
+    # GoogleDataTransport unit tests and pod linting using the default Xcode version.
     - stage: test
       env:
-        - PROJECT=GoogleDataLogger PLATFORM=iOS METHOD=xcodebuild
+        - PROJECT=GoogleDataTransport PLATFORM=iOS METHOD=xcodebuild
       before_install:
         - ./scripts/if_changed.sh ./scripts/install_prereqs.sh
       script:
         - ./scripts/if_changed.sh ./scripts/build.sh $PROJECT $PLATFORM
-        - ./scripts/if_changed.sh ./scripts/pod_lib_lint.sh GoogleDataLogger.podspec
+        - ./scripts/if_changed.sh ./scripts/pod_lib_lint.sh GoogleDataTransport.podspec
 
     # Daily test for symbol collisions between Firebase and CocoaPods.
     - stage: test