Add support for py38 and py39
Need to move to the latest sip 4.19* (probably 4.19.25) API v12.7
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Switch to Boa mambabuild -
Switch to Ninja build system on all platforms -
Add Python 3.8/3.9 builds -
add private copy ctor in sip class declarations -
clean build.sh and bld.bat with useless site-packages dir