add timestamp field to uORB msgs; sync timestamp whenever possible

msg/templates/uorb/msg.cpp.template

@@ -61,7 +61,7 @@ topic_name = spec.short_name
 
 sorted_fields = sorted(spec.parsed_fields(), key=sizeof_field_type, reverse=True)
 struct_size, padding_end_size = add_padding_bytes(sorted_fields, search_path)
-topic_fields = ["uint64_t timestamp"]+["%s %s" % (convert_type(field.type), field.name) for field in sorted_fields]
+topic_fields = ["%s %s" % (convert_type(field.type), field.name) for field in sorted_fields]
 }@
 
 #include <cinttypes>

msg/templates/uorb/msg.h.template

@@ -110,8 +110,6 @@ struct __EXPORT @(uorb_struct) {
 #else
 struct @(uorb_struct) {
 #endif
-@# timestamp at the beginning of each topic is required for logger
-	uint64_t timestamp; // required for logger
 @print_parsed_fields()
 
 #ifdef __cplusplus

msg/templates/uorb_microcdr/msg.cpp.template

@@ -147,7 +147,6 @@ void serialize_@(topic_name)(MicroBuffer *microCDRWriter, const struct @(uorb_st
 
     reset_micro_buffer(microCDRWriter);
 
-    serialize_uint64_t(microCDRWriter, input->timestamp);
 @add_code_to_serialize()
     (*length) = micro_buffer_length(microCDRWriter);
 }
@@ -159,6 +158,5 @@ void deserialize_@(topic_name)(MicroBuffer *microCDRReader, struct @(uorb_struct
 
     reset_micro_buffer(microCDRReader);
 
-    deserialize_uint64_t(microCDRReader, &output->timestamp);
 @add_code_to_deserialize()
 }

msg/templates/urtps/msg.idl.template

@@ -65,11 +65,10 @@ def add_msg_fields():
     for field in sorted_fields:
         add_msg_field(field)
 
-        
+
 }@
 @
 struct @(spec.short_name)_
 {
-    unsigned long long timestamp;
 @add_msg_fields()
 }; // struct @(spec.short_name)_