Refactor client and client-cli

Changed a few things. It's mostly organizational. Namely:

+ renamed 'Start' to 'Home'
+ reorganized client-cli into 'main.go' 'home.go' and 'genericwallet.go'
+ commented out functions that don't work / can't be used right now (anything relating to upload, download, send money, resize)
+ switched Keypair from pointer to non-pointer