Cryocon / Allow setting termination character

[astafan8]

• Make termination a kwarg of init, and pass it to super's init call.
• remove reset argument

Delft users discovered that the terminator is actually \r\n although \n also works. The hint to this was discovered when the queue of the visa responses got out of sync. But i've decided not to change the default terminator and just let the users set it, and if they confirm with usage that \r\n is the right one, then we'll change it.

[codecov]

Codecov Report

Merging #1559 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1559   +/-   ##
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  Coverage   71.54%   71.54%           
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  Files         105      105           
  Lines       12133    12133           
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  Hits         8681     8681           
  Misses       3452     3452