Remove space from Product Name for examples

In #2588 it was suggested that the space in the Product Name for
our example environments causes confusion when using a default build
because of the need to escape the space in the build filename.

This change removes the space from the Product Name in the project's
player settings.

Project/ProjectSettings/ProjectSettings.asset

   useOnDemandResources: 0
   accelerometerFrequency: 60
   companyName: Unity Technologies
-  productName: Unity Environment
+  productName: UnityEnvironment
-  m_ShowUnitySplashScreen: 0
+  m_ShowUnitySplashScreen: 1
   m_ShowUnitySplashLogo: 1
   m_SplashScreenOverlayOpacity: 1
   m_SplashScreenAnimation: 1
   xboxOneMonoLoggingLevel: 0
   xboxOneLoggingLevel: 1
   xboxOneDisableEsram: 0
+  xboxOneEnableTypeOptimization: 0
   xboxOnePresentImmediateThreshold: 0
   switchQueueCommandMemory: 1048576
   switchQueueControlMemory: 16384

com.unity.ml-agents/CHANGELOG.md

  - Fixed an issue when using GAIL with less than `batch_size` number of demonstrations. (#3591)
  - The interfaces to the `SideChannel` classes (on C# and python) have changed to use new  `IncomingMessage` and `OutgoingMessage` classes. These should make reading and writing data to the channel easier. (#3596)
  - Updated the ExpertPyramid.demo example demonstration file (#3613)
- - Updated project version for example environments to 2018.4.18f1 (#3618)
+ - Updated project version for example environments to 2018.4.18f1. (#3618)
+ - Changed the Product Name in the example environments to remove spaces, so that the default build executable file doesn't contain spaces. (#3612)
 
 ## [0.14.1-preview] - 2020-02-25