Add Bit-depth and Chroma test for UI

Author: whyb

src/HwCodecDetect/__init__.py

@@ -1,6 +1,7 @@
 # HwCodecDetect/__init__.py
 import os
 from .install_ffmpeg_if_needed import install_ffmpeg_if_needed
+from .gui import launch_gui, HwCodecGUI
 
 def _read_version():
     try:
@@ -14,4 +15,4 @@ def _read_version():
 __author__ = "whyb"
 __email__ = "whyber@outlook.com"
 __license__ = "BSD-3-Clause"
-__url__ = "https://github.com/whyb/HwCodecDetect"
+__url__ = "https://github.com/whyb/HwCodecDetect"