Change Git LFS to not include icons for UI

Currently Git LFS includes all images in the project, includin arrows and such for the UI. Since we do not want to pull all test data on every machine and the icons don't change that often, the easiest way to change that would be to only include media in the test folder in Git LFS.

The proposed change in the .gitattributes file would probably look like this: Before:

*.mp4 filter=lfs diff=lfs merge=lfs -text
*.avi filter=lfs diff=lfs merge=lfs -text
*.jpg filter=lfs diff=lfs merge=lfs -text
*.jpeg filter=lfs diff=lfs merge=lfs -text
*.mpeg filter=lfs diff=lfs merge=lfs -text
*.tif filter=lfs diff=lfs merge=lfs -text
*.wmv filter=lfs diff=lfs merge=lfs -text
*.png filter=lfs diff=lfs merge=lfs -text
*.MTS filter=lfs diff=lfs merge=lfs -text
*.M2T filter=lfs diff=lfs merge=lfs -text
*.MOV filter=lfs diff=lfs merge=lfs -text
*.AVI filter=lfs diff=lfs merge=lfs -text
*.MPG filter=lfs diff=lfs merge=lfs -text
*.m2ts filter=lfs diff=lfs merge=lfs -text
*.JPG filter=lfs diff=lfs merge=lfs -text
*.gif filter=lfs diff=lfs merge=lfs -text

After:

**/tests/**/*.mp4 filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.avi filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.jpg filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.jpeg filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.mpeg filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.tif filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.wmv filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.png filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.MTS filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.M2T filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.MOV filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.AVI filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.MPG filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.m2ts filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.JPG filter=lfs diff=lfs merge=lfs -text
**/tests/**/*.gif filter=lfs diff=lfs merge=lfs -text

Note: One probably needs to git lfs migrate export the UI icons to get them as files again.