Memory Leak due to TimeSegment widget

[ogewan]

flatpickr, the module used for timeSegment widget creates a div element every time it is instantiated but never disposes of itself
As a result any state change will generate more unused divs in the dom.
This is extremely problematic combined with undo/redo which causes a state change every operation.

[ogewan]

I can remove leftover divs when I create a new one with the same id using the layer name as the id
However, the layer name is not accessible when creating a layer via the add layer button for some reason

Additionally, GraphOperationLayerView is not disposed of correctly which means that timewidget can't remove the leftover div.

The partial solution mentioned at the beginning removes leftover diivs but all seg w/ graph layers created using the add layerbutton will share a timestamp widget which will lead to unintended behavior.