[Proposal] Allow Single Line Comments in more places.

This proposal unifies proposals #14 #21 in to more generalized proposal.
There are currently places where would like to have a single line comment, but not permitted.

Within **Object Initializer Lists** and **Collection Initializers**
eg
```vb.net
Dim XmlAppConfigReader As New XmlTextReader(Reader) With {
' Required by Fxcop rule CA3054 - DoNotAllowDTDXmlTextReader
.DtdProcessing = DtdProcessing.Prohibit,
.WhitespaceHandling = WhitespaceHandling.All
}
```
and
```vb.net
Shared Sub New()
Dim operators As New Dictionary(Of String, OperatorInfo)(IdentifierComparison.Comparer) From
{
{WellKnownMemberNames.OnesComplementOperatorName, New OperatorInfo(UnaryOperatorKind.Not)},
{WellKnownMemberNames.TrueOperatorName, New OperatorInfo(UnaryOperatorKind.IsTrue)},
{WellKnownMemberNames.FalseOperatorName, New OperatorInfo(UnaryOperatorKind.IsFalse)},
{WellKnownMemberNames.UnaryPlusOperatorName, New OperatorInfo(UnaryOperatorKind.Plus)},
{WellKnownMemberNames.AdditionOperatorName, New OperatorInfo(BinaryOperatorKind.Add)},
{WellKnownMemberNames.UnaryNegationOperatorName, New OperatorInfo(UnaryOperatorKind.Minus)},
{WellKnownMemberNames.SubtractionOperatorName, New OperatorInfo(BinaryOperatorKind.Subtract)},
{WellKnownMemberNames.MultiplyOperatorName, New OperatorInfo(BinaryOperatorKind.Multiply)},
{WellKnownMemberNames.DivisionOperatorName, New OperatorInfo(BinaryOperatorKind.Divide)},
{WellKnownMemberNames.IntegerDivisionOperatorName, New OperatorInfo(BinaryOperatorKind.IntegerDivide)},
{WellKnownMemberNames.ModulusOperatorName, New OperatorInfo(BinaryOperatorKind.Modulo)},
{WellKnownMemberNames.ExponentOperatorName, New OperatorInfo(BinaryOperatorKind.Power)},
{WellKnownMemberNames.EqualityOperatorName, New OperatorInfo(BinaryOperatorKind.Equals)},
{WellKnownMemberNames.InequalityOperatorName, New OperatorInfo(BinaryOperatorKind.NotEquals)},
{WellKnownMemberNames.LessThanOperatorName, New OperatorInfo(BinaryOperatorKind.LessThan)},
{WellKnownMemberNames.GreaterThanOperatorName, New OperatorInfo(BinaryOperatorKind.GreaterThan)},
{WellKnownMemberNames.LessThanOrEqualOperatorName, New OperatorInfo(BinaryOperatorKind.LessThanOrEqual)},
{WellKnownMemberNames.GreaterThanOrEqualOperatorName, New OperatorInfo(BinaryOperatorKind.GreaterThanOrEqual)},
{WellKnownMemberNames.LikeOperatorName, New OperatorInfo(BinaryOperatorKind.Like)},
{WellKnownMemberNames.ConcatenateOperatorName, New OperatorInfo(BinaryOperatorKind.Concatenate)},
{WellKnownMemberNames.BitwiseAndOperatorName, New OperatorInfo(BinaryOperatorKind.And)},
{WellKnownMemberNames.BitwiseOrOperatorName, New OperatorInfo(BinaryOperatorKind.Or)},
{WellKnownMemberNames.ExclusiveOrOperatorName, New OperatorInfo(BinaryOperatorKind.Xor)},
{WellKnownMemberNames.LeftShiftOperatorName, New OperatorInfo(BinaryOperatorKind.LeftShift)},
{WellKnownMemberNames.RightShiftOperatorName, New OperatorInfo(BinaryOperatorKind.RightShift)},
{WellKnownMemberNames.ImplicitConversionName, New OperatorInfo(UnaryOperatorKind.Implicit)},
{WellKnownMemberNames.ExplicitConversionName, New OperatorInfo(UnaryOperatorKind.Explicit)},
' These cannot be declared in source, but can be imported.
{WellKnownMemberNames.LogicalNotOperatorName, New OperatorInfo(UnaryOperatorKind.Not)},
{WellKnownMemberNames.LogicalAndOperatorName, New OperatorInfo(BinaryOperatorKind.And)},
{WellKnownMemberNames.LogicalOrOperatorName, New OperatorInfo(BinaryOperatorKind.Or)},
{WellKnownMemberNames.UnsignedLeftShiftOperatorName, New OperatorInfo(BinaryOperatorKind.LeftShift)},
{WellKnownMemberNames.UnsignedRightShiftOperatorName, New OperatorInfo(BinaryOperatorKind.RightShift)}
}

s_operatorNames = operators
End Sub
```

**LINQ Queries**
```vb
dim q = From x In xs
' Filter Odd
Where (x Mod 2) = 1
```