Add a setting for SDK download

[marla-singer]

Closes #1433

• Add fileds for setting Codegen instance in Setting platform: collection and view
• Change condition for button 'SDK Generator': Button is available if there is a setting for SDK generator
• Change host from generator.swagger.io to the Codegen instance defined in Settings.

[brylie]

Please be aware that @jykae is restructuring the Documentation module folder to follow our recently added folder structure guidelines.

The relevant part is as follows:

• /module_name
  • /client
    • /component
      • sub_component.html
      • sub_component.js
      • /sub_component
        • sub_component.html
        • sub_component.js

This prevents sub-components from needing their own client folders, since they are under a shared client folder.

[marla-singer]

Ok, I will pull changes by @jykae for Documentation module

[brylie]

Use ES2015 enhanced object literal notation here:

documentationLink () {
  ...
},

[brylie]

This PR looks good. There are a couple of cleanup and consistency improvements, noted above.

[brylie]

Also, consider linting this PR with ESLint. We have an open PR for ESLint configuration #1466, which you can use as a basis.

[brylie]

@marla-singer please resolve conflicts. We merged a refactoring branch that touched some of the documentation module files.

[brylie]

Thanks. We are trying to organize our code for consistency lately, so things are moving around as we are working.

[brylie]

When I try to save the Codegen setting, the form does not appear to submit. I click the button, but nothing happens. No error is visible in the console.

[brylie]

There appears to be a regression in the develop branch.

[marla-singer]

When I tested this feature on my old localhost version, it worked correct.
But now I did meteor reset and had this problem too. However another fields on this page don't work too.

[brylie]

It appears related to switching the Settings collection file to using export. I have a fix in progress.

[brylie]

See PR #1475

[brylie]

The fix may not be as simple as I originally thought. I will have to continue working on this tomorrow.