Improve docs on Filesystem and Storage apis

[mrodal]

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Some improvements:

• Explain how Storage is handled in non web platforms. What does it use instead of localstorage
• Explain how Filesystem is handled in different platforms (I found out by trial that Filesystem on web it uses indexeddb)
• In the Filesystem docs it mentions cloud backed locations, but it doesnt mention how to use them. Is it one of the FilesystemDirectory directories?
• In the Filesystem docs, mention how to handle binary files. (this is working for me: https://github.com/ionic-team/capacitor/issues/31#issuecomment-492779894)

Thanks, and great work, Im really liking capacitor 🙂

[kevinclarkadstech]

Also I was curious if there is any advantage to using the Capacitor Storage vs the Ionic Storage in an Ionic app.

[sabahang]

Having the same question as @kevinclarkadstech regarding the difference between the two

[kevinclarkadstech]

I decided not to use Ionic Storage because there are dependencies on Angular, although no reason there should be.

In the code there is

import { InjectionToken } from '@angular/core';

/** @hidden */
export const StorageConfigToken = new InjectionToken<any>(
  'STORAGE_CONFIG_TOKEN'
);

StorageConfigToken is created as an Angular InjectionToken but never used.

With that being said I am just using LocalForage, which is what @ionic/storage uses internally.

I haven't looked at Capacitor Storage in depth to see what it is using.