std.variant support, Windows improvements

Merge pull request #197 from WebFreak001/patch-1

support vibe.d 0.10.0

std.variant support, Windows improvements

• Added values conversion to std.variant.Variant
• Windows socket duplication implemented (needed for using vibe.d.db.postgresql on WIndows)

Deprecation messages amount reduced

Merge pull request #194 from denizzzka/deprecated_msgs_suppres

Reduces amount of "deprecated" mesages

Previously disabled UUID test enabled

v1.1.5

Previously disabled UUID test enabled

Some another -preview=in changes implemented

Merge pull request #189 from denizzzka/tests_preview_in

dflags: -preview=in added into tests

Fixed -preview=in support, again

Merge pull request #188 from denizzzka/instant_fix

instant fix for -preview=in support

Fixed -preview=in support

Merge pull request #186 from Geod24/new-dub-is-lit

Correct typo in dub.json: sourcePath => sourcePaths

Windows socket types changed

v1.1.2-winimpr.3

Windows: sockets sizes are euqal, comment removed

Windows improvements

• posixSocketDuplicate implemented
• Test fixed for Windows

Compilation fix on DMD v2.100.0

Merge pull request #175 from hatf0/fix-build-v2.100.0

Fix build on DMD v2.100.0