Extract UsbCommand_GetAdcValue() to its own file.

right/src/usb_commands/usb_command_get_adc_value.c

@@ -0,0 +1,8 @@
+#include "usb_protocol_handler.h"
+#include "slave_drivers/kboot_driver.h"
+#include "peripherals/adc.h"
+
+void UsbCommand_GetAdcValue(void)
+{
+    *(uint32_t*)(GenericHidOutBuffer+1) = ADC_Measure();
+}