fixed EDU-233, switched to flat model in offset listener
(cherry picked from commit 7567c0f)
fixed test result printer for python3
(cherry picked from commit 54c0fcf)
EDU-254 Change course information: invalid case
(cherry picked from commit 541d42a)
EDU-255 Change course information: course name in project view is not updated
(cherry picked from commit 92d39f1)
fixed EDU-256 Do not show run selection menu on gutter icon if there is only one item to select
(cherry picked from commit accd7e7)
fixed EDU-253 Replace tests template
(cherry picked from commit e3d115d)
updated course archive
(cherry picked from commit 81f8131)
wording
(cherry picked from commit bfb9a5b)
EDU-258 Actions names in the keymap are not consistent to other names
(cherry picked from commit 5611a35)
added action to change cell type
(cherry picked from commit bc73c3d)
EDU-227 Show balloon with link to tutorials and add action to help
(cherry picked from commit bb676fb)
changed case in action names
(cherry picked from commit c0519d6)
fixed vertical layout preferred layout height
(cherry picked from commit 94a5b6f)
part of EDU-257 updated all visible information about shortcuts but not immediately
(cherry picked from commit a753e9b)
no need to blur tab text

(cherry picked from commit a6988633d1add0affe6c1bbb4d15a3278b418db5)
IDEA-129887 Welcome screen redesign

(cherry picked from commit 3b35b879ecb9ba18ecf12032f56f11969627b400)
IDEA-123797 It is impossible to edit watch item (set bounds equally)
(cherry picked from commit edac86f)