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/python/intern/bpy_app_translations.h

@@ -22,6 +22,6 @@
 #define __BPY_APP_TRANSLATIONS_H__
 
 PyObject *BPY_app_translations_struct(void);
-void      BPY_app_translations_end(void);
+void BPY_app_translations_end(void);
 
 #endif /* __BPY_APP_TRANSLATIONS_H__ */