Split up on_close and on_open kwargs and fix Windows

[puddly]

This PR splits rtsdtr_on_open and rtsdtr_on_close into separate kwargs for dtr_on_open, rts_on_open, etc.

I've also fixed Windows pin low behavior with RTS_CONTROL_DISABLE.

Fixes #107.

[codecov]

Codecov Report

❌ Patch coverage is 91.30435% with 6 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (dev@7261b30). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
serialx/platforms/serial_win32.py	45.45%	6 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             dev     #111   +/-   ##
======================================
  Coverage       ?   92.47%           
======================================
  Files          ?       22           
  Lines          ?     3747           
  Branches       ?        0           
======================================
  Hits           ?     3465           
  Misses         ?      282           
  Partials       ?        0           

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