Clean up ScriptEditor Layout

[benloh]

TO DO

• [ ] Fix height of navbar so "Blueprint" selector menu and "CLOSE" buttons are not cut off
• [x] Get rid of extraneous "SCRIPT: bpname" line -- duplicates the selection menu
• [ ] Make Wizard/Code tab switching more obvious -- round top tabs?
• [ ] Refine layout of Bookmark area -- fix padding, height
• [ ] Reduce size of "Select Script" and "Delete" buttons to give more room for code
• [x] Add padding-left to slot editor help text
• [ ] Add padding top and bottom to ScriptView_Pane wizard view so that [+] line buttons are not cut off.

Maybe?

• [ ] Show Sim view when editing instances so that you can see placement changes?