Synchronet Virtual DOS Modem for Windows

First commit.

Right now it just connects/accepts-connections using raw TCP. As demonstrated in YouTube video:
https://www.youtube.com/watch?v=fxp38Nde3fg
14 jobs for dailybuild_linux-x64 in 9 minutes and 57 seconds (queued for 12 seconds)
Status Name Job ID Coverage
  Build
passed jsdoor-freebsd #35081
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passed jsdoor-linux #35082
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passed jsdoor-windows #35084
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passed syncdraw-freebsd #35079
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passed syncdraw-linux #35080
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passed syncterm-freebsd #35077
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passed syncterm-linux #35073
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passed syncterm-windows #35078
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