BS-7271 : Update the file

- Change the engine log level in studio on INFO level by default
BS-6865: add missing header
BS-6865: clean code
BS-7271: Modify log level by default of engine inside the studio to INFO
Remove unused import
Merge branch 'master' into 'BS-6672_Log_enhancements'
Merge branch 'master' into 'BS-6672_Log_enhancements'
BS-6865: clean code to try understanding how some expressiosn are
filtered
BS-7273: add property in order that default value of data appears in
Tree view
BS-7273: clean code
Merge branch 'master' into BS-6672_Log_enhancements

Conflicts:
	bundles/plugins/org.bonitasoft.studio-models/process.genmodel
BS-7776
Only check custom connector definition
BS-7776
Only check custom connector definition unit tests
Merge branch 'master' into 'BS-7150_UserMetadata6_3'
BS-1088: fix grammar

Conflicts:
	bundles/plugins/org.bonitasoft.studio.common/messages.properties
BS-7402: Add translations (missing just one sentence in Deutsh)
BS-1088: update messages to have more precise explanation why the name
is not a valid java identifier
BS-2896: add updated image in the installer
BS-2896: update messages in the installer
BS-7856: update logo and installer to 6.3.0