[META] Release Drupal 9 on June 3 2020

Here is a markdown tree of all the issues that are not done yet starting from this one. Certainly more to identify and parent to the respective issues but we are getting to a set that shows the extent and kind of work ahead of us. Most things are possible to make significant moves on now, and in fact need significant moves made on soon so no need to wait for the Drupal 9 branch or anything.

Updated issue tree. Includes up to date issue data, including:

- critical issues are floated to the top of branches and have a red circle
- major issues follow them and have a blue circle
- meta/plan issues now have a tree icon for consistency (otherwise those that do not have children [yet] may not be apparently hiding various issues)
- issue status included abbreviated (active, needs review, needs work, postponed or rtbc)

Markdown file generated to the formatting requirements of MindNode again.

Updated my mindmap script, so it now colors issues that are major (yellow) or critical (red) and it also marks issues that are meta/plan as a bubble instead of all of them being a simple branch. Should make overviews easier. This required me to adopt the Freemind XML format, so that is attached. (The PDF was still generated by MindNode out of the freemind source).

Re @Mile23 about Simpletest, we are trying to focus this issue primarily on stuff that we must do. The Drupal 9 release date is driven by our dependencies. So we need to do our release in 2020, period. We can add on top our own requirements and some we believe are must do and some we believe we should do. There has been steady progress to eliminate Simpletest, so I am positive that it has a very good chance to being removed in Drupal 9 :) To make it a requirement to be removed is a different question though.

Updating the mindmap / issue tree. No visual presentation changes just a data update. I did do considerable issue management to get here and updated / re-parented some issues to get to their "right" place. The txt file is still in FreeMind XML format.

Updating with concrete release date and link to more up to date plan.

New mindmap based on current status.

Adding sour code of script I use to generate the mindmap for posterity / reusability.

Updated issue summary.

Update issue summary. We are not using the issue tree visuals anymore as it got very unwieldy.

Better mark done things.

Update plan now that RC1 is out. Release still expected on June 3, 2020 in two days.

All done now. See drupal.org/9