PHP enum generation issues

[MIchaelMainer]

We've noticed some issues with the code generation for PHP and how it handles enums.

• [ ] For example, VoiceGender. The member names are uppercase but are generated as lower case.

  <EnumType Name="VoiceGender">
    <Member Name="Female" Value="0" />
    <Member Name="Male" Value="1" />
  </EnumType>
  

• [ ] Enum members with underscores in the name have the underscore removed. For example, in DeviceManagementSubscriptions, Member Name="intune_EDU" becomes

  const INTUNE_EDU = "intuneEDU"; AB#7580