Feature: Media picker modal

[loivsen]

Description

Added Media picker modal.

Other changes:

• RTE uses Media Picker rather than Media Tree Picker.
• Dropzone can now use the browse function from the uui file dropzone.
• Dropzone now takes in a parentUnique for uploads.

Missing:

• Media picker modal search function
• Thumbnail of images in media picker

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)