Remove action tag from individual handlers

[hendrikhofstadt]

Since we are already adding an action tag in the baseApp runMsgs we should not add the same one again in the individual handler.

Also it might make more sense to prepend the action tag instead of appending it to make parsing more simple.

Additionally I would recommend adding a divider between data of the single messages to simplify parsing.

cosmos-sdk/baseapp/baseapp.go

Line 624 in aa72e72

data = append(data, msgResult.Data...)

Ideally we would have tags/data per message.

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[cwgoes]

We should indeed remove the duplicate action tags.

Tags will eventually turn into events (ref tendermint/tendermint#1859).