Update sample projects to cmake

src/vga.cpp

@@ -7,6 +7,7 @@
 
 #include "pico/stdlib.h"
 #include "pico/printf.h"
+#include "pico/multicore.h"
 
 #include "picovga.h"
 #include "vga.pio.h"
@@ -1057,6 +1058,17 @@ void VgaCore()
 	}
 }
 
+/**
+ * @brief Starts the VGA core on core1
+ */
+void StartVgaCore()
+{
+	// stop VGA core
+	multicore_reset_core1();
+	// run VGA core
+	multicore_launch_core1(VgaCore);
+}
+
 // request to initialize VGA videomode, NULL=only stop driver (wait to initialization completes)
 void VgaInitReq(const sVmode* vmode)
 {