getuserdir, in Win retrieve %APPDATA% instead of %HOMEPATH%

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
saveplotlycredentials, proper paths (fix for win)

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
signup, prompt for email and username, then prompt to save credentials

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
OO plotly, session is state

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
Added a few other files to OO subfolder

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>