Github release plugin, Kotlin, Okio and OkHttp updated
Toml4j removed and replaced with 4koma - improves null safety, immutability, TOML compliance
kotlin-result removed (I don't think it was used anyway)
SpaceSafeURI replaced with PackwizPath which handles special characters much better (fixes#5)
Fixed directory traversal issues
Hashing system rewritten for better type safety and cleaner code
Download mode changed to use an enum
Request system completely rewritten; now uses OkHttp for HTTP requests (fixes#36, fixes#5)
Added request interceptor which retries requests (fixes#4)
Removed: support for extracting packs from zip files (and Github zipballs)
Cleaner exceptions; more improvements pending (in particular showing request failure causes)
Improved speed of cancelling in-progress downloads
Better support for installing from local files (no file: URI required; though it is still supported)
Various code cleanup changes
Now always asks the user before proceeding past the point where optional mods could be selected and configured
When updating files, the hash is checked so an update isn't redownloaded if it already exists
Added DevMain file for running in a dev environment
