New model for the dynamic crawler (#1322)

* New model for the dynamic crawler

* Added Dynamic Crawler to yaml

* Attatch model to brain

* Remove unneeded player brain

UnitySDK/Assets/ML-Agents/Examples/Crawler/Brains/CrawlerDynamicLearning.asset

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UnitySDK/Assets/ML-Agents/Examples/Crawler/Brains/CrawlerLearning.asset

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config/trainer_config.yaml

     num_layers: 3
     hidden_units: 512
 
+CrawlerDynamicLearning:
+    normalize: true
+    num_epoch: 3
+    time_horizon: 1000
+    batch_size: 2024
+    buffer_size: 20240
+    gamma: 0.995
+    max_steps: 1e6
+    summary_freq: 3000
+    num_layers: 3
+    hidden_units: 512
+
 WalkerLearning:
     normalize: true
     num_epoch: 3

UnitySDK/Assets/ML-Agents/Examples/Crawler/TFModels/CrawlerDynamicLearning.tf.meta

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UnitySDK/Assets/ML-Agents/Examples/Crawler/Brains/CrawlerPlayer.asset

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UnitySDK/Assets/ML-Agents/Examples/Crawler/Brains/CrawlerPlayer.asset.meta

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UnitySDK/Assets/ML-Agents/Examples/Crawler/TFModels/DynamicCrawler.bytes.meta

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