ClangFormat: apply to source, most of intern

Apply clang format as proposed in T53211.

For details on usage and instructions for migrating branches
without conflicts, see:

https://wiki.blender.org/wiki/Tools/ClangFormat

source/blender/freestyle/intern/python/BPy_ViewMap.h

@@ -41,8 +41,7 @@ extern PyTypeObject ViewMap_Type;
 
 /*---------------------------Python BPy_ViewMap structure definition----------*/
 typedef struct {
-	PyObject_HEAD
-	ViewMap *vm;
+  PyObject_HEAD ViewMap *vm;
 } BPy_ViewMap;
 
 /*---------------------------Python BPy_ViewMap visible prototypes-----------*/