Document the dynamic text fixtures, utility functions, and the interrupt
test support. Reorder some sections and reword some paragraphs based on
review comments.
Update #3199.
Update requirements engineering chapter due to the removal of Doorstop
as the requirements management tool.
Update the application configuration related specification items.
Update #3715.
Converted https://devel.rtems.org/wiki/Developer/Git/Committers
to Rest, and TBDs and wiki TODOs into comments. Also changed http
links to https (the ones that are possible), corrected some typos,
created a folder for eng images and added some formatting.
This work was part of GCI 2018.
