RoboRemo - arduino control etc

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- separate input fields for address and port for TCP and UDP connection
- extended color options for sliders, level indicators and LEDs
- custom line color for plots
- custom color and text size for labels and buttons text
- new UI item: joystick
- division (/) support in interactive labels (of level indicator / slider / plot)
- multi-line support in button text and item labels
- fixed bug in USB drivers. More boards supported now, including ST-LINK/V2-1 found on STM32 Nucleo-64 boards.