FEATURE: Support dimensions and cropping for SVG Images

[Jan3k3y]

Feature: #5652

Previous MR: #5658
-> recreated cause maintainers could not maintain

Upgrade instructions

existing svg will have no dimensions which should be generated via ./flow media:refreshsvgdimensions
newly added/uploaded svg files will automatically have dimensions

Checklist

• Code follows the PSR-2 coding style
• Tests have been created, run and adjusted as needed
• The PR is created against the lowest maintained branch
• Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• Reviewer - The first section explains the change briefly for change-logs
• Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[mficzel]

@mhsdesign I would like to discuss this:

• On the one hand i really think we should have svg dimensions and cropping
• On the other hand the solution is really hacky ... and i must know it since i made the template

It may be wise to take this topic to the media sprint and nut rush a fearture in that later on limits us. I mean those that like to live dangerous can use the sitegeist package.