Added in SharpSSH lib and copy-pasted the FTP addon and renamed things to SCP.
Tonnes of modifications to get rid of FTP "branding" and replace with SCP. Reduced UI to a basic form. Can perform basic SCP operation!
Added working progess bar. SharpSSH has a nasty way to do it, but this works fairly well.
SCP now removes the temporary file when sending to server
Added support to provide a path to store the file.
Fixed bug where a lack of trailing "/" on http string caused the URL to be malformed.