added master kwarg for all widgets and removed *args

test/manual_integration_tests/test_tabview.py

@@ -0,0 +1,16 @@
+import customtkinter
+import tkinter.ttk as ttk
+
+app = customtkinter.CTk()
+
+tabview = customtkinter._CTkTabview(app)
+tabview.pack(pady=20, padx=20)
+
+tabview.create_tab(identifier="tab1", text="Tab 1")
+tabview.select_tab("tab1")
+
+
+switch = customtkinter.CTkSwitch(app, text="Darkmode", onvalue="dark", offvalue="light",
+                                 command=lambda: customtkinter.set_appearance_mode(switch.get()))
+switch.pack(padx=20, pady=20)
+app.mainloop()