### What problem does this PR solve?
Feat: The Begin and IterationStart operators cannot be deleted using
shortcut keys #4287
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
- [x] New Feature (non-breaking change which adds functionality)
---------
Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>
Co-authored-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
Fix: The right coordinates of Categorize and Switch operators are
misplaced #3868
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
feat: Automatically save agent page data #3301
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: Display input parameters on operator nodes #3240
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: Add hint for operators, round to square, input variable, readable
operator ID. #3056
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
### What problem does this PR solve?
feat: Build options for the component id field of the Switch operator
#1739
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: Add bing and google operator #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: change all file names to lowercase #1574
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: modify DuckDuckGo's style #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: display the debugging results of each operator in a pop-up window
#918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
