Fix sdist (#165)

* setup.py - include missing .h files

* TypeTreeHelper.c - fix setter return

* bump version

Author: K0lb3

UnityPy/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "1.9.22"
+__version__ = "1.9.23"
 
 from .environment import Environment
 from .helpers.ArchiveStorageManager import set_assetbundle_decrypt_key

UnityPyBoost/TypeTreeHelper.c

@@ -702,7 +702,7 @@ TypeTreeNode_setType(TypeTreeNodeObject *self, PyObject *value, void *closure)
     if (!PyUnicode_Check(value))
     {
         PyErr_SetString(PyExc_TypeError, "The type attribute value must be a string");
-        return NULL;
+        return -1;
     }
     PyMem_Free(self->m_Type);
     char *type = PyUnicode_AsUTF8(value);
@@ -724,7 +724,7 @@ TypeTreeNode_setName(TypeTreeNodeObject *self, PyObject *value, void *closure)
     if (!PyUnicode_Check(value))
     {
         PyErr_SetString(PyExc_TypeError, "The name attribute value must be a string");
-        return NULL;
+        return -1;
     }
     PyMem_Free(self->m_Name);
     char *name = PyUnicode_AsUTF8(value);

manifest.in

@@ -0,0 +1,2 @@
+recursive-include UnityPyBoost *.c
+recursive-include UnityPyBoost *.h