I was wondering if anyone could tell me how to make it so that sublime text 3 automatically updates the sidebar when i add a new folder/file to the current project in finder
I had this problem after reinstalling Sublime Text 2 and symlinking.
A workaround I found was binding the refresh_folder_list command with cmd+s, since that's usually when we see the sidebar updating.
For this to work you'll need to install run_multiple_commands plugin.
Then you'll have to update your User Keymap telling it to refresh folder list every time you save. The syntax is fairly simple.
I also ran across Synced Side Bar after fixing the issue. I am not sure if this is a solution but sounds promising.
Hope this helps.