Allow user to override generated functions in convert

[RichardLindhout]

Do a three-way-diff merge for changes and let user choose parts of code which should not take over generated code.

{defaultNameOfResolver}_custom.go Every function which is stated there will be skipped in generation.

[RichardLindhout]

The program will now look in the package and look for functions with the same name as the generated one's. If a custom one exist e.g.

convert_override.go

package helpers

import (
    "github.com/../app/backend/graphql_models"
    "github.com/../app/backend/models"
)

func UserCreateInputToBoiler(
    m *graphql_models.UserCreateInput,
) *models.User {
    if m == nil {
        return nil
    }

    originalConvert := originalUserCreateInputToBoiler(m)
    // TODO: bcryp pass
    return originalConvert
}

The function in the template get's changed to userCreateInputToBoiler

[RichardLindhout]

Released in v3.1.0