Set/reset the world modified flag and 'DEF' fields#6686

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MNikoliCC wants to merge 12 commits intocyberbotics:masterfrom

MNikoliCC:fix-def-save-scene-tree

Commits on Oct 24, 2024

Fix issue #5225: All modified 'DEF' fields are reset to their initial values when the simulation is reset. The world modified flag is only set when the simulation time is 0 and there is a change be…
MNikoliCC
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Commits on Oct 28, 2024

Remove Timer, Implement Singleton Pattern in 'WbNodeEditor', Emit A New Signal When The 'world' Instance Is Created
MNikoliCC
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