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fix definition of iTasks.Engine.lesser; was already done in 0c66fcb8 but got lost somehow...

Add ondestroy handler for tcp connections

See merge request !240

validate string length of editors also on server

See merge request !239

validate string length of editors also on server; otherwise invalid initial/refreshed values are accepted

Normally you can gracefull clean up in iTasks by hooking into the
onDisconnect handler, however, if the IOtask is destroyed by for example
a step, it was impossible to gracefully close the connection.

To fix this, this commit:

- Patches the tcp connections used internally (async, {web,sds}service, tonic)
- Adapts the wrapping tasks from Internal.Task
- Adapts processIOTask to get an onDestroy handler
- When an IOTask is destroyed, read the task state once more, call the
  onDestroy handler and possibly write some data once more. This can be
  used to gracefully close any connections to services that cannot
  reasonably detect broken TCP connections

Resolve "Remove background tasks (again)"

Closes #232

See merge request !226

add dynamic editor extension

See merge request !238

add importTextDocument task

See merge request !237

Merge branch '232-remove-background-tasks-again' of gitlab.science.ru.nl:clean-and-itasks/iTasks-SDK into 232-remove-background-tasks-again

also clean up imports in the files that are touched

Leaflet: add circle/rectangle & editable objects

See merge request !235

fix resizing for bottom sidebar

See merge request !234

Small improvements related to form components

See merge request !233

use 'input' instead of 'keyup' event to generate events for form UI components; this prevents missed inputs by right mouse click -> paste/cut

The order of processEvents is also changed

This cannot be a regular task since it always needs to run at the end

Merge branch 'master' of gitlab.science.ru.nl:clean-and-itasks/iTasks-SDK into 232-remove-background-tasks-again

export user admin management sub-tasks

See merge request !232

introduce >-| as abbreviation for '>>- \_ ->'

See merge request !231

Updated the Collection extension to the new overloaded SDS API.

See merge request !230