Add support for Random.image

[DanBurkhardt]

Add support for:

• Image API datasource, potentially supporting multiple types of image APIs
• Random.image // returning any UIImage in the universe constrained only to defaults
• Random.image.unconstrained config option to remove any default constraints in compression or format
• RandomImagePreferences struct with configurable options for contentType, format, compression level, sizeLimitation & others
• ImageContentType enum // some specification of the type of content to return, eg: [.profilePhoto, .person, .animal, .nature, .sports]
• ImageFormat // e.g. .gif, .jpg, .png, .hvec
• ImageCompressionLimit // .uncompressed (default), .large, .small, .medium
• ImageSizeLimitation accepting a double representing the maximum file size the image should be compressed to
• Image compression function // already existing in one of our other projects
• Random.image.prefs -- a setter / getter for prefs config & persistence / override
• Random.image.with(_ format: ImageFormat)
• Random.image.compressed(_ to: ImageCompressionLimit)
• Random.image.limited(to fileSize: Double)
• Save any images for a session to the /tmp/ directory
• An option to specify whether or not to save the image permanently to the documents directory
• An option to return all random images currently present in either /tmp/ or /documents

// TODO: evaluate a RandomImage object & properties vs extending UIImage

• Random.image.localUrl returning the location on-device & from the correct bundle
• Random.image.sourceUrl returning the original source
• Random.image.extension returning the extension of the file type as a String for UniversalType indentification use with CoreMobileServices & drag / drop features\
• Random.image.name returning only the source filename excluding extension
• Random.image.fileName returning the filename including the extension
• Random.image.size.kb returning size in KB
• Random.image.size.mb returning size in MB

[DanBurkhardt]

This will likely be broken into several parts to focus on one topic at a time, but this is the current wishlist.