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/gpu/gpu_py_vertex_format.h

@@ -25,11 +25,10 @@
 
 extern PyTypeObject BPyGPUVertFormat_Type;
 
-#define BPyGPUVertFormat_Check(v)     (Py_TYPE(v) == &BPyGPUVertFormat_Type)
+#define BPyGPUVertFormat_Check(v) (Py_TYPE(v) == &BPyGPUVertFormat_Type)
 
 typedef struct BPyGPUVertFormat {
-	PyObject_VAR_HEAD
-	struct GPUVertFormat fmt;
+  PyObject_VAR_HEAD struct GPUVertFormat fmt;
 } BPyGPUVertFormat;
 
 PyObject *BPyGPUVertFormat_CreatePyObject(struct GPUVertFormat *fmt);