feat: expand settings API (#1192)

* feat: unified config foundation

* refactor: separate user-facing settings and move thumbnail code

* feat: impl profiles, thumbnail.prefer_smallest_format, remove default_format

* feat: implement auto_opened, auto_created, and claim_generator_infos settings

* feat: impl auto_opened setting

* fix: default all_actions_included in actions assertion to true

* fix: all test cases

* docs: cleanup comments and document new functions

* test: add thumbnail tests

* fix: auto actions assertion, lots of tests, crash when empty actions, and optional settings values

* fix: optional signer settings and document get_profile_settings_signer

* docs: document Builder::add_auto_actions_assertion

* test: remove test code in test

* feat: add settings to CLI

* docs: create an example c2pa.toml settings

* fix: cli settings

* feat: add config path and env vars for cli settings arg

* fix: remove bmp and ico from supported thumbnails

* fix: single claim generator info and rename load settings functions

* test: remove scoped settings

* refactor: remove profiles and document digital source type

* feat: allow specifying digital source type for auto actions in settings

* refactor: convert usage of json settings to toml

* refactor: move global settings functions into public `Settings` struct

* refactor: move builder settings into its own module

* fix: add ingredient uris to auto actions, only add placed actions if not added already, and use builder claim gen info or settings

* feat: add `Settings::from_url`

* feat: setup base for remote signers and cawg signers in settings

* feat: impl `RemoteSigner` and fix when pulling optional settings

* feat: prefer_smallest_format tiff->jpeg

* feat: allow specifying infer operating system for claim generator info

* refactor: default test signer in `Settings`

* fix: source type optional for auto add actions and use ref for test signer to prevent freeze

* feat: add `ActionsSettings`, all_actions_included, action_templates, actions

* docs: add new fields to c2pa.toml

* fix: wip change serde_json::Value in settings to toml::Value (issues with this in TODO comments)

* fix: actions/action_templates and add tests, use toml for defining settings instead of setting each field

* test: cleanup and add more builder and settings tests

* fix: make_thumbnail_from_stream format before stream in parameters

* docs: finish documenting some settings structs

* fix: private Settings set/get_value

* test: add allActionsIncluded by default when signing to test

* style: +nightly fmt

* fix: feature flag thumbnails and wasm

* test: fix hash_alg string

* fix: remove cawg_signer, doc cli config path, move signer to top-level settings, fix wasi issue by reset settings before test, resourceref icons

* feat: define ActionSettings

* fix: remove Settings top-level export for now

* test: add remote signer test with mock server

* fix: change `builder.signer` setting to just `signer`

* fix: test sample toml and fix up fields

* test: don't use httpmock on wasm

* test: fix wasi test

Author: ok-nick