* Add plugin option for protogen in Makefile
* Fix the generator for the plugin in util/protogen
* Erase convertable types, move helpful methods to gRPC protobufs
* Erase helpers for convertations
* Generate StableMarshlal/StableSize for protobufs by the protoc plugin
Signed-off-by: Airat Arifullin a.arifullin@yadro.com
I knew one day `sed` would save me an hour of manual work:
```
sed -i -n -e '
s/) Set/) Set/
p
t setter
b end
:setter
n
s/nil/nil/
t hasif
p
b end
:hasif
n
:loop
p
n
s/}/}/
t end
b loop
:end
' $@
goimports -w $@
```
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
