Bias-T now works in capture mode

Simplified soundboard app, still some work to do
Merge remote-tracking branch 'upstream/master'

firmware/common/lpc43xx_cpp.hpp

@@ -108,7 +108,7 @@ inline void clear() {
 
 namespace cgu {
 
-enum class CLK_SEL {
+enum class CLK_SEL : uint8_t {
 	RTC_32KHZ	= 0x00,
 	IRC			= 0x01,
 	ENET_RX_CLK = 0x02,

firmware/common/ui_widget.hpp

@@ -37,6 +37,7 @@
 #include <memory>
 #include <vector>
 #include <string>
+#include <functional>
 
 namespace ui {