EnumValueView should consider the FlagsAttribute

[pfleck]

The current EnumValueView offers a combobox to select the enum values.

If the enum has the FlagAttribute, a list of checkboxes should be displayed instead, to allow arbitrary combinations of the enum values.

[pfleck]

r14597

• Added a ListView for Flag-attributed enums in the EnumValueView.
• Simplified EnumValue cloning (already done in base-constructor).
• Added a SetFlag helper for enums.

[pfleck]

Because EnumValues with Flags are not used yet in the trunk I used the following test script:

  public override void Main() {
    vars.MyEnum = new EnumValue<MyEnum>();
    vars.MyEnumFlags = new EnumValue<MyEnumFlags>();
    vars.MyEnumFlagsFoo = new EnumValue<MyEnumFlagsFoo>();
  }
  enum MyEnum {
    First, Second, Third
  }
  [Flags] enum MyEnumFlags {
    First, Second, Third, Forth, Sixth, Seventh
  }
  [Flags] enum MyEnumFlagsFoo {
    None = 0, First = 1 << 0, Second = 1 << 1, Third = 1 << 2,  Forth = 1 << 3, Sixth = 1 << 4, Seventh = 1 << 5
  }

[pfleck]

r15009 Moved EnumHelper (for SetFlags).

[mkommend]

r15010: Fixed caption of EnumValueView.

[mkommend]

Reviewed r14597, r15009, and r15010.

[mkommend]

r15117: Merged r14597, r15009, r15010 into stable.