Organize Redux types

[tskarhed]

The types are all in one file, I think it's mostly related to Redux. Some reorganization is needed, as it is getting quite complex. Any input is helpful!

https://github.com/tskarhed/setlist/blob/master/src/state/types.ts

[PranjalAgni]

I think if we break the reducers and action creators in their own files then it would be more manageable in long term. We can also group the redux action types with its specific action creator

[tskarhed]

Sounds like a good idea! I am considering removing the specific actions, in favor of more general ones, such as UPDATE_SONG. This is to easier sync with Firebase (#61)

[PranjalAgni]

Yes looking at number of action/reducers app has currently, we need to first group the similar types of actions in their separate files and also take care while refactoring we do not miss something