Offline support

• Add an offline mode to prevent elm-review from making any HTTP requests. This is useful for CI environments that should not have access to the internet, where you only want to run elm-review without arguments.
• Introduce prepare-offline subcommand to have elm-review fetch and pre-build all the necessary data when it has network access to prepare for being run using elm-review --offline.
• Replaced the internally used elm-json dependency with elm-solve-deps-wasm, which should be more reliable, re-enable support for old MacOS versions as well as improve performance.
• Fixed a crash when using --template from the same repository but from two different paths.
• Fixed an issue where project rules created using elm-review new-rule mixed the ModuleContext and ProjectContext.

v2.10.0...v2.11.0