Remove NS_DESIGNATED_INITIALIZER

Caused an error in 6.0.1
Switch to use CocoaPods instead of submodule
Install CocoaAsyncSocket through CocoaPods

Instead of having a copy in the project.
ACEView for syntax highlighter and proper editor

First step towards getting a better editor for writing the Nu code in place.

Use submodules for ACEView
Fix the resizing of send command button