Prepare for ObjectiveC/ObjectiveC++ code

This commit modifies the clang-format configuration and workflow to support ObjectiveC and ObjectiveC++ code.

Signed-off-by: Anselm Busse <anselm.busse@outlook.com>

.clang-format

@@ -23,6 +23,7 @@ BraceWrapping:
   AfterEnum: false
   AfterFunction: false
   AfterNamespace: false
+  AfterObjCDeclaration: false
   AfterUnion: false
   BeforeCatch: true
   BeforeElse: true

.github/workflows/clang.yml

@@ -22,7 +22,7 @@ jobs:
       uses: DoozyX/clang-format-lint-action@v0.13
       with:
         source: './sunshine'
-        extensions: 'cpp,h'
+        extensions: 'cpp,h,m,mm'
         clangFormatVersion: 13
         style: file
         inplace: ${{ matrix.inplace }}