handleFileInput return base64encoded url now.

[imranaalam]

by using readAsDataURL function instead readAsText; now all data formats would be easily read as encode64 which can be later changed back to original file. https://base64.guru/

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[ghost]

DeepCode's analysis on #80ee1d found:

• ❌ 3 critical issues, ⚠️ 2 warnings, ℹ️ 1 minor issue. 👇

Top issues

Description	Example fixes
Unsanitized input from data from a remote resource flows into a member access and is used to access a property of a field assignment by name. This may allow a malicious user to access methods (e.g. toString) as opposed to regular properties of objects and cause a crash, remote code execution or more serious problems. This is known as a Prototype Pollution vulnerability. Occurrences: dashjoin-json-schema-form.js:1764 dashjoin-json-schema-form.js:1773	🔧 Example fixes
Unsanitized input from data from a remote resource flows into get, where it is used as an URL to perform a request. This may result in a Server-Side Request Forgery vulnerability. Occurrences: dashjoin-json-schema-form.js:1888	🔧 Example fixes
Unsanitized user input from data from a remote resource flows into RegExp, where it is used to build a regular expression. This may result in a Regular expression Denial of Service attack (reDOS). Occurrences: dashjoin-json-schema-form.js:2146 dashjoin-json-schema-form.js:2229 dashjoin-json-schema-form.js:2238	🔧 Example fixes

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[aeberhart]

Thanks for the pull request. Can you please add an issue where you describe the issue you're fixing?
Ideally, your change should be as small as possible (i.e. only fix the issue in the handle upload function).
If you have other changes (let's say a styling improvement) I'd be best to make another pull request for that.
This would help you tremendously and make sure we can merge your change asap so you can use it in the next version.