Ability to save spec by calling remote url and load spec by getting data from remote url + way to clear settings

[sergeyglazyrindev]

Hello guys!
I am working on integrating open api support into some go project (uadmin -> but I am heavily changing it to be easily used in real projects)
So, I found this project, I am gonna provide a way to start a server where developers which use uadmin have out of the box way to start locally oaie-sketch and ability to load/save spec from/to remote url.
So, I refactored this project a little bit, now it's ready to be published as own npm package that could be easily used in javascript world.
The main goal is provide a way to work with oaie-sketch locally.
Please review my solution.

[sergeyglazyrindev]

Here is an example of usage:
For example I open my local url: http://localhost:8083/?saveToFileEndpoint=/spec
and in this changeset I store/load spec from the fs.
sergeyglazyrindev/uadmin@2d7b445

[sergeyglazyrindev]

This is first step of improvements, I am gonna move all code into typescript and cover with tests, etc.