Allows reading and writing default serial port and baudrate (this also is available via the web interface) and setting the host and port on which the server should listen. Might allow persisting more options in the future.
The configuration file is stored in ~/.printerwebui/config.ini under Linux, in %APPDATA%/PrinterWebUI/config.ini under Windows and should be stored in ~/Library/Application Support/config.ini under MacOS X
Closes#1
win32 defaults to %APPDATA%/Cura/uploads
macos defaults to ~/Library/Application Support/Cura/uploads (I hope, can't test it...)
linux defaults to ~/.cura/uploads
Server now also checks if file to be uploaded or deleted ends on .gcode and makes filename secure before doing anything on the filesystem
Also added favicon ;) and some bla to the README.md
