General

add comments to Transmission, Style and Application
added a hook to rebuild layouts
style: do not calculate font each time there is a call to it.
refactor on SpCodePresenter: instead a matrix to complete (doItContext, doItReceiver, etc.) now there is a hierarchy of "InteractionModels"the user can extend and use.
#iconNamed: moved to SpApplication.
Text: create the concept of userActionDuring: to avoid multiple actualisations when changing selection, text, etc. all at once.
Remove tests for Pharo 8 since it is not supported anymore.
Window: add vocabulary: isMinimized/isMaximized
ToolBar was renamed as Toolbar.
Lots of cleanups on dependencies to be able to split Spec2 from Morphic.

Bugfixes

fix a problem in popover which was not abswering correct "lines"to print.
sometimes we ask to center a widnow to its parent, but there is no parent. In that cases, center to world.
fix problems in the Style merge algorithm\
List: fixed problems with selection and sorting.
Application was leaking windows. Not anymore.