[codeathon]Add AdvancedConverter to convert massively and recursively CSS OPI to Phoebus BOB files

[katysaintin]

Add AdvancedConverter to convert massively and recursively CSS OPI to Phoebus BOB files

• Manage a opi folder in addition to a list of a opi
• Recursive conversion and reproduce the same tree structure of the original
• Copy pictures files in the output folder if the output is different of opi folder, respecting the tree structure
• Modify the import in script files (embedded scripts too) to use Phoebus "org.csstudio.display.builder" import
• Copy scripts files to phoebus_files in order to allow opi files use the original script file that use "org.csstudio.opibuilder" import
• Update the references in generated bob file for Linking Container (replace by bob file), for phoebus scripts .
• Create corresponding unit test
• Create a app to call AdvancedConverter
• Add a documentation
• Fixing other issues unexisting properties and widgets and so on see https://github.com/ControlSystemStudio/phoebus-converter