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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

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

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

Add missing imports of Data.Map.GenJSON

See merge request !229

adapt to move of JSON instances to Data.Map.GenJSON

See merge request !228

properly destroy task instances when they are deleted

See merge request !227

Merge branch '190-sapl-record-selection-sometimes-returns-a-singleton-array-which-causes-issues-with' into 'master'

Resolve "Sapl record selection sometimes returns a singleton array which causes issues with +"

Closes #190

See merge request !155

Merge branch 'master' into 190-sapl-record-selection-sometimes-returns-a-singleton-array-which-causes-issues-with

Asynchronous share evaluation

Closes #156

See merge request !201

improve user admin

Closes #268

See merge request !225

Resolve "Move ScalableExts.Scalable to Platform"

Closes #261

See merge request !223

use maximum from Data.Foldable instead of Data.List

See merge request !224

Resolve "Background tasks destroyed with sessions"

Closes #267

See merge request !222

don't provide possibility to register in Readable class; makes it possible to define SDS types which are readable, but not Registrable