[ADD] (sale/purchase)_product_matrix

addons/product/models/res_config_settings.py

addons/product_matrix/__init__.py

addons/product_matrix/__manifest__.py

addons/product_matrix/data/product_matrix_demo.xml

addons/product_matrix/models/__init__.py

addons/product_matrix/models/product_template.py

...ns/product_matrix/static/img/matrix_mycompany_tshirt.jpeg

...s/product_matrix/static/src/js/section_and_note_widget.js

addons/product_matrix/static/src/scss/product_matrix.scss

addons/product_matrix/static/src/xml/product_matrix.xml

addons/product_matrix/views/assets.xml

addons/product_matrix/views/matrix_templates.xml

addons/purchase/models/res_config_settings.py

addons/purchase/views/res_config_settings_views.xml

addons/purchase_product_matrix/__init__.py

addons/purchase_product_matrix/__manifest__.py

addons/purchase_product_matrix/models/__init__.py

addons/purchase_product_matrix/models/purchase.py

...rchase_product_matrix/report/purchase_order_templates.xml

...se_product_matrix/report/purchase_quotation_templates.xml