I am not familiar with what a snake and camel case is, but if you have script open in the Editor, you do a Find/Replace for all scripts in the document by doing:
- Click "Search"
- Click "Find in Files..." in the drop down menu
- Enter your search string in the 'Find' field
- Select "Replace..."
- and then enter your replacement text to replace all occurrences
Doing the above approach blindly is dangerous, since you might introduce undetected syntax issues (or worse, logic error that don't make a compilation error) in your scripts. So I suggest you review the preview pane at the bottom before replacing everything (it will show you all text instances that match your query that will be replaced)