Update Tutorial 3 (8 chapters) to use the OpenCPI GUI
### Summary From https://opencpi.gitlab.io/releases/latest, Tutorial_3_Component_Based_Development_Intro_GUI.pdf contains old AV information and needs to be updated. To update the PDF, you have to remove the sections in the LibreOffice **source** that describe how to perform a given tutorial step with AV GUI and replace them with a description of how to perform the step with the new OpenCPI GUI. There is **not** a 1-to-1 correspondence between AV GUI and OpenCPI GUI sections, since OpenCPI GUI does not currently provide some of the functionality (like GUI-based creation of applications and HDL assemblies) that AV GUI provides. Sections that have no OpenCPI GUI equivalent need to be removed. For example, now both CLI and new GUI instructions for creating an application are the same: open the stub OAS XML file with a text editor and type in the provided XML code. Generating the PDF for just the GUI (or the CLI) involves toggling a LibreOffice variable on the title page. The document generator automatically does that. Instructions for how to do it during documentation development to be provided. ### Acceptance criteria A non-expert GUI user can follow the tutorial using the latest version of the GUI, and all examples are consistent.
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