Remove jquery from loading event

[mbraak]

• removed onLoading option
• removed $el attribute from tree.loading_data event

[github-actions]

Size Change: -42 B (0%)

Total Size: 28.4 kB

Filename	Size	Change
./lib/dataLoader.js	821 B	-32 B (-4%)
./lib/tree.jquery.js	5.95 kB	-10 B (0%)

ℹ️ View Unchanged

Filename	Size
./lib/dragAndDropHandler/dragElement.js	437 B
./lib/dragAndDropHandler/generateHitAreas.js	1.05 kB
./lib/dragAndDropHandler/index.js	2.2 kB
./lib/dragAndDropHandler/iterateVisibleNodes.js	551 B
./lib/dragAndDropHandler/types.js	33 B
./lib/elementsRenderer.js	1.82 kB
./lib/jqtreeMethodTypes.js	33 B
./lib/jqtreeOptions.js	33 B
./lib/keyHandler.js	738 B
./lib/mouseHandler.js	1.47 kB
./lib/mouseUtils.js	229 B
./lib/node.js	3.22 kB
./lib/nodeElement/borderDropHint.js	386 B
./lib/nodeElement/folderElement.js	915 B
./lib/nodeElement/ghostDropHint.js	529 B
./lib/nodeElement/index.js	738 B
./lib/nodeUtils.js	194 B
./lib/position.js	384 B
./lib/saveStateHandler.js	1.55 kB
./lib/scrollHandler.js	471 B
./lib/scrollHandler/containerScrollParent.js	874 B
./lib/scrollHandler/createScrollParent.js	521 B
./lib/scrollHandler/documentScrollParent.js	1.05 kB
./lib/scrollHandler/types.js	33 B
./lib/selectNodeHandler.js	684 B
./lib/simple.widget.js	947 B
./lib/util.js	348 B
./lib/version.js	146 B

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (feb6273) 93.12% compared to head (d525f38) 93.15%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #779      +/-   ##
==========================================
+ Coverage   93.12%   93.15%   +0.02%     
==========================================
  Files          30       30              
  Lines        2312     2307       -5     
  Branches      594      591       -3     
==========================================
- Hits         2153     2149       -4     
+ Misses        159      158       -1     

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