Source is lost after page refresh (f5)

[gpersoon]

@todo

• cache current file in localStorage so it's not lost on page refresh

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Expected Behavior

When refreshing the webpage of the editor (https://ethereum-play.github.io/editor-solidity/) I would expect that the (edited) source stays present.
I refresh can be triggerd by F5, by metamask (when changing networks) or other ways.

Current Behavior

Currently the source is lost and replaced by the default demo contract: SimpleStorage

Possible Solution

Steps to Reproduce

• Go to: https://ethereum-play.github.io/editor-solidity/
• Edit some lines
• Press F5 in the browser
• Observe the changed source is lost

Context (Environment)

• Chrome Version 76.0.3809.132 (Official Build) (64-bit) on Windows 10

Detailed Description

Possible Implementation