Merge branch '65-port-to-sip-4-19' into 'master'

Update to SIP 4.19 and build for python 2 on Linux

See merge request !4
5 jobs for master in 6 minutes and 41 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
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linux
build-linux

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passed #15156
linux
build-linux

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  Build Noarch
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conda
build-noarch

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  Deploy
passed #16155
conda linux manual
deploy-devel

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passed #15158
linux conda manual
deploy-devel

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