feat: registery based diagnostician (#1077)

* feat: add a Dagnostics registry that controls severity

An Diagnostic registry is now responsible for adding a severity instead
of the diagnostic itself. The registry is the default diagnostics
assessor. Diagnostics no longer have an own severity field as a result.

* Rename error to new
* Diagnostics config option
* feat: add registry serializer

Added the option to load a diagnostics configuration
Added tests for the configuration
Added the basic api to print the configuration

* feat: add command line option to parse plc_diagnostics

A  new parameter (`--error-config`) can now be used to include a json
file with the default behaviour for errors

* feat: add an explain flag to the compiler

Error messages now show the error code in the report
At the end of the compilation a hint is shown to use the new explain
flag for more info

* feat: add the possiblity to print the error config

The error configuration can now be printe using `plc config diagnostics`

Added documentation about the new commands to the book
* Make sure windows runs on 1.75
* Reword some errors

Author: ghaith

.github/workflows/rust.yml

@@ -67,7 +67,7 @@ jobs:
     name: Test Windows
     runs-on: windows-2022
     env:
-      toolchain-version: 1.70.0
+      toolchain-version: 1.75.0
       llvm-version: 14.0.6
     steps:
 

.gitignore

@@ -1,5 +1,6 @@
 /target
 /target-watch
+/output
 /.idea
 **/*.rs.bk
 **/*.un~