Merge pull request ruslo#1817 from xsacha/patch-7

Add OpenCV 3.4.6

Boost: ++PACKAGE_INTERNAL_DEPS_ID

Custom upload server: More checks for upload readiness

Merge pull request ruslo#1805 from ErniBrown/pr.zmqpp

Added zmqpp version 4.2.0

tvm 0.5-p4

mxnet 1.4.0-p2

Merge pull request ruslo#1801 from dvirtz/pr.cmcstl2

add cmcstl2

Add autogenerated

Update lehrfempp to 0.7.18 (ruslo#1799)

Merge pull request ruslo#1798 from chfast/pr.snappy

Upgrade Snappy to v1.1.7