* try extend path to solve PyQt5.sip not found issue
* disable private sip installation in sippackage class
* undo manual PyQt5 dir creation in py-sip site-packages dir
* fix typo
* fix typo
* also apply fix to PyQt4
* tidy up
* flake8 and tidy up
* tidy and undo hardcoding of python_include_dir
* replace hardcoded python inc dir
* fix minor issues
* rethink include dir variable name
* improve style
* add new versions
* implement new sip setup to qsci installation
* set sip-incdir correctly for the new setup
* setup extend_path thing before qsci python bindings
* take care of conflict
* flake8
* also extend for PyQt4
* improve style
* improve style
* SipPackage build sys should depend on py-sip
* consolidate extend_path fixes into SipPackage
* fix typo
* fix bugs
* flake8
* revert sip doc to pre-resource setup
* import os module
* flake8
Co-authored-by: Sinan81 <sbulut@3vgeomatics.com>
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