Update cmake to support win builds#83

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ngodber wants to merge 6 commits intoPyMesh:masterfrom

Commits on Jun 24, 2021

define ssize_t for msvc builds.
ngodber
committed

Commits on Jun 25, 2021

remove redundant msvc compiler directives. remove empty function that is not called.
ngodber
committed
update cmake to support win dll installs.
ngodber
committed

Commits on Jun 28, 2021

remove internal boost
ngodber
committed
fix missing algorithm headers
Neil Godber
committed

Commits on Jun 29, 2021

fix missing algorithm imports under some compilation schemes.
ngodber
committed