Rendering support for GTK platform

[knocte]

In an analogous way as it was done here (#785) it would be great to have GTK support.

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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This issue now has a funding of 208.0 DAI (208.0 USD @ $1.0/DAI) attached to it.

• If you would like to work on this issue you can 'start work' on the Gitcoin Issue Details page.
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• $40,999.61 more funded OSS Work available on the Gitcoin Issue Explorer

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work has been started.

These users each claimed they can complete the work by 3 weeks, 2 days ago.
Please review their action plans below:

1) mierzynskim has been approved to start work.

Hey!
As we previously discussed via email, I'd like to develop GTK support.

Learn more on the Gitcoin Issue Details page.

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work for 208.0 DAI (208.0 USD @ $1.0/DAI) has been submitted by:

1. @mierzynskim

@knocte please take a look at the submitted work:

• PR by @mierzynskim

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• Learn more on the Gitcoin Issue Details page
• Want to chip in? Add your own contribution here.
• Questions? Checkout Gitcoin Help or the Gitcoin Slack
• $41,332.41 more funded OSS Work available on the Gitcoin Issue Explorer

[gitcoinbot]

⚡️ A *Linux Wizard* Kudos has been sent to @mierzynskim for this issue from @knocte. ⚡️ The sender had the following public comments: good work! Nice work @mierzynskim! Your Kudos has automatically been sent in the ETH address we have on file.