Created firmware file loading dialog for when "Load" button is pressed.
Raises Error box if the file is not a valid Hex File or if it is an
empty file.
Remove menubar
Add Swift icon
Added piksi_firmware submodule
Print stderr to the embedded console
Change some names and add TODO's
Change to different print stream wrapper class and add change output
writing function. Added a hack to make '\r' characters in prints delete
the line in the embedded console.
Use Console and put OutputWrapper instantiations inside it
Removing 'stdout' arg from OutputWrapper