Remove 1.6.0 deprecated functionality

[joeyparrish]

Quoting the changelog:

Deprecated:

• The following methods on Player are deprecated in favor of
  configure()/getConfiguration() and will be removed in v1.6.0:
  • enableAdaptation
  • getAdaptationEnabled
  • setStreamBufferSize
  • getStreamBufferSize
  • setLicenseRequestTimeout
  • setMpdRequestTimeout
  • setRangeRequestTimeout
  • setPreferredLanguage
  • setRestrictions
  • getRestrictions
  • Configure player method #93
• A new two-argument ContentProtectionCallback has been added to
  DashVideoSource, and the old style is deprecated and will be removed
  in v1.6.0.
  • better support multi-DRM with one ContentProtection element #71