Added error message formats and a couple error messages; Did some cleanup; made things compile again
Added error messages for GET BLOCK requests
Added error messages for GET FILE requests
Added error messages for GET FOLDER requests
Added error messages for POST BLOCK requests
Added error messages for POST FILE requests
Added error messages for POST FOLDER requests
Added error messages for handling unrecognized messages to the server
Added DELETE FOLDER and FILE functionality, messages, and error handling
Merged in a whole bunch of stuff