[vtx] Add VTX driver with Tramp and SmartAudio support

msg/VtxTable.msg

@@ -0,0 +1,35 @@
+uint64 timestamp # time since system start (microseconds)
+
+uint8 NAME_LENGTH = 16
+uint8 BAND_NAME_LENGTH = 12
+uint8 POWER_LABEL_LENGTH = 4
+uint8 CHANNELS = 16
+uint8 BANDS = 24
+uint8 POWER_LEVELS = 16
+
+# Configuration name in ASCII without null termination
+uint8[16] name
+
+uint8 bands
+uint8 channels
+# Frequency is in MHz
+# Invalid frequencies are set to 0
+uint16[384] frequency # 24*16 = 384
+
+# Band names in ASCII without null termination
+uint8[288] band_name # 24*12 = 288
+
+# Band letters in ASCII
+uint8[24] letter
+
+# Band attributes
+uint8 ATTRIBUTE_FACTORY = 0
+uint8 ATTRIBUTE_CUSTOM = 1
+uint8[24] attribute
+
+uint8 power_levels
+# Positive values are the exact value the VTX protocol expects to set the power level
+# Negative values are alternative values depending on the VTX protocol and device
+int16[16] power_value
+# The power labels as ASCII without null termination
+uint8[64] power_label # 4*16 = 64