Merge branch 'prop-partial-specialisation' into 'master'

Properties: use partial template specialization.

See merge request !53
9 jobs for master in 4 minutes and 12 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed clang-c++11 #68957
Linux

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passed cppcheck #68959
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passed doc #68964
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passed gcc-c++11 #68956
Linux

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passed macos-c++11 #68958
Apple

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passed VS2015-32-bit #68963
VS2015

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passed VS2015-64-bit #68962
VS2015

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passed VS2017-32-bit #68961
VS2017

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passed VS2017-64-bit #68960
VS2015

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