Implement ICollection<TNoteEnum> for NoteCollection

[TheBoxyBear]

This would give more purpose to the extra methods using the enum and guarantee compliance, allowing the use of LINQ on a NoteCollection using the enum instead of the note object.

[TheBoxyBear]

This causes conflicts trying to use LINQ on a NoteCollection. ICollection methods can be used with the enum through LINQ such as Contains using Any. Would add a Remove method using the enum as this cannot be done with LINQ.