Release for review of initial development

• rework output directories structure
• add list packs --missing option
• categorize .cc extension as source c++
• introduce for-compiler and setup controls​
• accept multiple contexts selection via wildcards
• replace misc C* by C-CPP
• replace plural by singular keywords define, undefine, add-path, del-path
• retrieve local pack version from pdsc
• fix missing gpdsc warning
• fix CPRJ pack vendor