* move allowed MIME types to own util file
* add check for safe MIME type before choosing how to upload
* check for allowed blob type to decide what component to load
* re-add check for safe mimetype
* fix bracket positioning
* move allowed MIME types to own util file
* add check for safe MIME type before choosing how to upload
* check for allowed blob type to decide what component to load
* re-add check for safe mimetype
* fix bracket positioning