*Suggestion* default generation target path

[focused]

Suggestion

Change default generation target path of mix task mix waffle.g to "data" application.

Reasoning

Let's say i have a crawler application for example, and it consists of three subapplications: "ecto" part, "crawl" part, and "CLI" part, there is no "web" application with controllers, views and templates:

my_app/
| lib/
| | my_app/
| | my_app_crawler/
| | my_app_cli/

"Crawler" app and "CLI" app may fetch images from remote host or process from user input in console - two different ways of getting image data. I want to have one place to describe transformation and storing image data process, so it's obviously should be put into "data" application, because "data" applications are responsible for storing/validation, not "web" applications.

Actual behaviour (it puts generated uploader under "/lib/#{app_name}_web/uploaders/"):

waffle/lib/mix/tasks/g.ex

Line 55 in 8dcaede

model_destination = Path.join(File.cwd!, "/lib/#{app_name}_web/uploaders/#{underscore(model_name)}.ex")

Example

New skeleton would look like this:

lib/
| | my_app/
| | | accounts/
| | | | profile.ex
| | | | profile_uploader.ex
| | | | user.ex
| | | | user_key_uploader.ex
| | | shared/
| | | | attachment_uploader.ex
| | | accounts.ex
...