Merge pull request #491 from S7NetPlus/plc-status Plc status

Merge pull request #485 from dylandrush/484_Public_PLCExceptions Made all exceptions public

Release S7NetPlus 0.18.0 Release highlights: - Add Memory/Span support from 0.17.0 to < net5 targets

Release S7NetPlus 0.17.0 Release highlights: - Add Read-/WriteBytes overloads for Span<byte> and Memory<byte>

0.16.0: Release S7NetPlus 0.16.0 Release highlights: - Fix UInt32 reads in classes - Add string support for classes

Release S7NetPlus 0.16.0 Release highlights: - Fix UInt32 reads in classes - Add string support for classes

Release S7NetPlus 0.15.0 Release highlights: - Add flowed cancellation to ConnectAsync

Release S7NetPlus 0.14.0 Release highlights: - Support setting the Encoding for S7String

Release S7NetPlus 0.13.0 Release highlights: - Change default TSAP for S7 200 - Add S7 200 Smart support - Add support for custom TSAP's - Align data to even bytes when parsing responses from class and struct reads - Close connection on IOException - Add cancellation for Read/Write - Set default Read-/WriteTimeout to 10 seconds - Cleanup of sync helper methods

Release S7NetPlus 0.12.0 Release highlights: - Add synchronization to methods interacting with the PLC