EMI: Remove MusicEntry constructors to fix C++98 compile error.
Merge pull request #1001 from Akz-/emi-sounds-rebase

EMI: Remove MusicEntry constructors to fix C++98 compile error.
EMI: Make sure the music state id does not exceed the number of entries in the music table.
EMI: Implement ImPause and ImResume.
EMI: Accept .lab suffix when detecting MP3 music.
EMI: Initialize _looping in SCXTrack.