Move auto-generated files to a cache folder

[radutopala]

Store the auto-generated root/app/aah.go and root/app/aah_app_vfs.go maybe in root/app/cache/ or root/cache, just to be clear for the developer that these files shouldn't be editable and that they are auto-generated on each run or build.

[jeevatkm]

@radutopala Agreed. Its good to differentiate auto-generated files.

I believe directory root/app/cache would be appropriate, since directory app is meant for Go source files.

[jeevatkm]

Going with directory name as generated at <app-base-directory>/app/generated. Since v0.12.0 release bring new module cache. Just on safer side and not to introduced confusion.

It will be imported on main file. Example -

 _ "<app-import-path>/app/generated"

This directory gets cleaned on every run, compile and build.

[jeevatkm]

Done 😄