This reverts commit 3bc97481.

Previous default filter was showing "In Progress" by default. Need to
show Upcoming and In Progress. Create a filter and use it be default.

Add tracking to various important fields in project_sprint. The most
important one being when a task get assigned to a sprint. Use message
subtype to allow users to follow or unfollow.

Improve the messaging experience by adding a new subtype. This allow
users to subscribe or not to to Git Commits.

Change the style of the logo to limit the size of it otherwise is take
all the space.

General refactor to make the code testable and to support gitlab and
github webhook. Also add testcases to avoid regression and ease testing.

Rename the field 'task_code' to 'code' to ease transition to
project_task_code in OCA repo.

When using multiple database, we need some tweak to make it work as
system wide module. Otherwise the hook is not register an nothing
happen.