Codechecker

With the new 5.0 version we switched to rolling release.
Automatic database upgrades are supported to newer schema versions.

- new you can add paths with regular expressions in the skip file
- module and target field are removed from the database and filters (they are superflous)
- bug fixes

:hammer: Improvements
* Rework UI to handle CodeChecker's autodetection by Discookie in https://github.com/Ericsson/CodecheckerVSCodePlugin/pull/130

:hammer: Improvements
* **Initial multi-root support** in https://github.com/Ericsson/CodecheckerVSCodePlugin/pull/121
Adds support for CodeChecker 6.22's automatic compilation database detection. If no compilation database is specified, and there is none in CodeChecker's output folder, the extension will use CodeChecker's autodetection (for 6.22 and above). For 6.21, and the mentioned cases, the behaviour remains the same.
* **Notifications overhaul** in https://github.com/Ericsson/CodecheckerVSCodePlugin/pull/116
Added a sidebar view to show past notifications. The notifications actions can still be executed through the sidebar, even if the user disabled pop-up notifications.
* **Notifications for the executed processes** in https://github.com/Ericsson/CodecheckerVSCodePlugin/pull/120
Added notifications for adding CodeChecker log and analyze commands to the queue, and then executing them.
They are mainly displayed on the sidebar, and there are actions for killing the process or removing them from the queue.
:bug: Bug fixes
* **Migrate to Yarn 2+ and bump dependencies** in https://github.com/Ericsson/CodecheckerVSCodePlugin/pull/123
* **Fix build command argument for CodeChecker log** in https://github.com/Ericsson/CodecheckerVSCodePlugin/pull/124
* **Extend timeout for file watcher events** in https://github.com/Ericsson/CodecheckerVSCodePlugin/pull/125

:hammer: Improvements
* **Refactor report tree** (112)
Refactor the report tree's code.
Display depth of report steps.
Group reports by severity levels.
* **Add Go to docs button to sidebar** (109)
The documentation URLs are fetched by running CodeChecker checkers at project load.
* **Add architecture.md** (105)
Adapted from my private notes with minimal changes, but should be fine for this purpose.
The image can be edited via https://draw.io/.
* **Integrate CodeChecker log into executor** (108)
Fixes (38).
Instead of running CodeChecker log as a separate process, it is now integrated into the `backend/executor.
Added commands, build tasks, UI buttons for running CodeChecker log.
Added settings to specify custom args as well as a build command, which can be overridden by commands or tasks.
Added a couple tests for the backend.
:bug: Bug fixes
* **Improvements for handling CodeChecker version checks** (114)
* **Fix handling of removed processes from the execution queue** (110)
* **Refactor keyboard navigation** (106)

For more information check the [milestone](https://github.com/Ericsson/CodecheckerVSCodePlugin/milestone/4).