reformat edit forms

[kevinpapst]

Description

Re-arranged customer/project/activity forms and addd an icon form extension

Can be tested at:
https://demo-branch.kimai.org/en/admin/customer/
https://demo-branch.kimai.org/en/admin/project/
https://demo-branch.kimai.org/en/admin/activity/

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I verified that my code applies to the guidelines (composer kimai:code-check)
• I updated the documentation (see here)
• I agree that this code is used in Kimai and will be published under the MIT license

[lock]

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