Floating Point Numbers

• Added floating number support to showNumber() for TM1637 displays with decimal points.

Examples

TM1637TinyDisplay display(CLK, DIO);

// Display floating point number
display.showNumber(1.234);    // Displays: 1.234
         
// Display floating point numbers with 2 decimal place formatting
display.showNumber(0.123456, 2);    // Displays: _0.12

// Display integer number (without decimal)
display.showNumber(42);    // Displays: __42