Theme override

[bmarty]

Content

Give ability to override theme color at build time.
Get color from ElementTheme instead of MaterialTheme when possible.

Motivation and context

Allow Element Enterprise customization.

Screenshots / GIFs

Tests

• Should not impact the EXA application, only minor changes on the colors.

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 24
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• You've made a self review of your PR

[ElementBot]

	Fails
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	Messages
📖	This pull request seems relatively large. Please consider splitting it into multiple smaller ones.

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[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