Remove slider divisions and add text field for all sliders

[mjansen4857]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 99.57265% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.20%. Comparing base (da4e4af) to head (1a6bcc8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...idgets/editor/tree_widgets/event_markers_tree.dart	98.78%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #846      +/-   ##
==========================================
+ Coverage   84.02%   84.20%   +0.17%     
==========================================
  Files          87       87              
  Lines        8395     8497     +102     
==========================================
+ Hits         7054     7155     +101     
- Misses       1341     1342       +1     

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