More resilient app.go modification process for the scaffolder

[lumtis]

Is your feature request related to a problem? Please describe. Modification in app.go depends on variables with an assumed name: app (most important), keys, appCodec, etc... Those variables names can be modified, this would make the scaffolding process generating an invalid app

Describe the solution you'd like We must extend the cosmosanalysis package feature set and implement methods to detect structure instantiation and detect variable names. If inconsistencies are detected, we make skip the app modification

Describe alternatives you've considered We must at least detect if some variable names are used and skip app modification, we should prevent generating an app that doesn't compile

[salmad3]

Need to investigate further criteria for resilient app.go, beyond name detection and structure instantiation.