Fixes

• Fixed issue where adTime events were increasing memory consumption. 
• Fixed issue where VAST ad video quality was always chosen as the lowest quality.
• Fixed issue where the JWPlayerItem.adSchedule API for IMA ads was being ignored. 
• Fixed a crash when configuring the player twice in a row before the player was fully initialized. 
• Fixed a crash when the player was configured in background before the player was fully initialized.