Fixes for Compare Double Naan, IgnoreDateTimeOffsetTimezones and CompareReadOnly

Fixes for Compare Double Nan, IgnoreDateTimeOffsetTimezones, and CompareReadOnly == false.

• https://github.com/GregFinzer/Compare-Net-Objects/issues/244
• https://github.com/GregFinzer/Compare-Net-Objects/issues/245
• https://github.com/GregFinzer/Compare-Net-Objects/issues/246