Replace BitMaskOptionSet with OptionSet

[zunda-pixel]

Issue

Fixes #139

What does this PR Do?

Remove BitMaskOption and BitMaskOptionSet and replace with OptionSet.

[zunda-pixel]

note: OptionSet Macro has overflow problem.
I will try to use BigUInt.
https://github.com/attaswift/BigInt/

@attached(member, names: named(RawValue), named(rawValue), named(`init`), arbitrary)
@attached(extension, conformances: OptionSet)
public macro OptionSet<RawType>() = #externalMacro(module: "SwiftMacros", type: "OptionSetMacro")


@OptionSet<UInt8>
struct Parameters {
  enum Options: UInt8 {
    case p0 = 0
    case p7 = 7
    case p8 = 8
    case p9 = 9
  }
}

print(Parameters.p0.rawValue) // 2^0 = 1
print(Parameters.p7.rawValue) // 2^7 = 128
print(Parameters.p8.rawValue) // 2^8 = 0(overflow)
print(Parameters.p9.rawValue) // 2^9 = 0(overflow)

[zunda-pixel]

I think OptionSet has rawValue but it should be have meaning.
Enum (be conforming BitMaskOptionSet)'s rawValue has meaning. I think we can replace to OptionSet.