[WIP] [SDL-0250] Next RPC Indication for the HMI

[YuriiLokhmatovGitHub]

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Implements #0250

Risk

This PR makes [no / minor / major] API changes.

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Core Tests

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[YaroslavLutsenko]

1. Please add changes to AddCommand RPC. I think MenuReplaceUtilities (or something like this) has to be updated also.
2. Maybe I missed some logic, but I didn't find how SDLSoftButtonObject sets NextFunctionInfo into SDLSoftButton.

[YuriiLokhmatovGitHub]

• Please add changes to AddCommand RPC. I think MenuReplaceUtilities (or something like this) has to be updated also.
• Maybe I missed some logic, but I didn't find how SDLSoftButtonObject sets NextFunctionInfo into SDLSoftButton.

1. The thing is, there is no mention that AddCommand RPC should be changed on the mobile side but on HMI side only and I am trying to follow the proposal.
2. SDLSoftButtonObject sets NextFunctionInfo onto a new created SDLSoftButton instance in the method
   - (SDLSoftButton *)currentStateSoftButton {...}
   which is being called in the 2 following operations:
   SDLSoftButtonReplaceOperation and SDLSoftButtonTransitionOperation (pls see SDLSoftButtonObject.m, line 110).

Thank you for your feedback.

[YaroslavLutsenko]

• Please add changes to AddCommand RPC. I think MenuReplaceUtilities (or something like this) has to be updated also.
• Maybe I missed some logic, but I didn't find how SDLSoftButtonObject sets NextFunctionInfo into SDLSoftButton.

1. The thing is, there is no mention that `AddCommand` RPC should be changed on the mobile side but on HMI side only and I am trying to follow the proposal.

2. SDLSoftButtonObject sets NextFunctionInfo onto a new created SDLSoftButton instance in the method  `- (SDLSoftButton *)currentStateSoftButton {...}` which is being called in the 2 following operations: `SDLSoftButtonReplaceOperation` and `SDLSoftButtonTransitionOperation`  _(pls see SDLSoftButtonObject.m, line 110)_.

Thank you for your feedback.

1. I think this point needs to be deceased on our sync call.
2. Thanks, I got it.