Dual licensing: AGPL + Element Commercial

[manuroe]

Make it clear that the code is dual licensed.

There are 3 commits:

• a big 7d8adc4 with all the source files header change
• 0e7d814 introduces the new LICENSE-COMMERCIAL file
• 225f711 updates the "Copyright & License" section of the README (made with @yousefhashaishi, approved by @lampholder )

[github-actions]

	Warnings
⚠️	This pull request seems relatively large. Please consider splitting it into multiple smaller ones.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against 225f711

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
908	1	907	0

View the full list of 1 ❄️ flaky tests

PreviewTests test_joinRoomScreen()

Flake rate in main: 19.57% (Passed 74 times, Failed 18 times)

Stack Traces | 2.69s run time

failed - Snapshot "Invite" does not match reference.

@−
"file:.../__Snapshots__/PreviewTests/test_joinRoomScreen-iPhone-16-pseudo.Invite.png"
@+
"file:.../tmp/PreviewTests/test_joinRoomScreen-iPhone-16-pseudo.Invite.png"

To configure output for a custom diff tool, use 'withSnapshotTesting'. For example:

    withSnapshotTesting(diffTool: .ksdiff) {
      // ...
    }

The percentage of pixels that match 0.9671936 is less than required 1.0
The lowest perceptual color precision 0.306875 is less than required 0.98 (PreviewTests/Sources/PreviewTests.swift:85)

To view more test analytics, go to the Test Analytics Dashboard
📢 Thoughts on this report? Let us know!

[pixlwave]

LGTM, the find and replace caught both copies of the IDETemplateMacros.plist file 👌