Refactor Network Settings Actions

[alexruzenhack]

The NETWORKSETTINGS_* actions are not conveying the best meaning, as stated in this commit 095510f and this comment on PR(10)#350. Here is a proposal to change it:

Actions

• NETWORKSETTINGS_UPDATE_REQUEST: an action triggered by user to update the network settings submitted through the form
• NETWORKSETTINGS_PERSIST_STORE: an action triggered by an update effect demanding that the network settings produced by it be persisted in the app storage
• NETWORKSETTINGS_UPDATE_STATE: an action triggered by init effect to update the Redux state with the custom network settings stored
• NETWORKSETTINGS_UPDATE_WAITING: an action triggered by persist effect to indicate that the persistence is complete and the wallet needs to be reloaded
• NETWORKSETTINGS_UPDATE_SUCCESS: an action triggered after wallet reload and the current network settings status is WAITING.
• NETWORKSETTINGS_UPDATE_INVALID: an action triggered by update request effect to mark the request as invalid
• NETWORKSETTINGS_UPDATE_FAILURE: an action triggered by either the update effect or the persist effect, controlled by the network settings saga, to indicate that the update has failed
  - [ ] NETWORKSETTINGS_UPDATE_STATUS: action triggered to change network settings status either for READY or LOADING

Statuses

• READY: default status
• LOADING: once the update request is made
• WAITING: once the network settings are persisted
• SUCCESSFUL: once the update succeeds
• FAILED: once the update fails