remove liveportrait and update requirements

.flake8

@@ -4,4 +4,3 @@ plugins = flake8-import-order
 application_import_names = arcface_converter
 import-order-style = pycharm
 per-file-ignores = preparing.py:E402
-exclude = face_swapper/LivePortrait

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "face_swapper/LivePortrait"]
-	path = face_swapper/LivePortrait
-	url = https://github.com/KwaiVGI/LivePortrait

mypy.ini

@@ -6,4 +6,3 @@ disallow_untyped_defs = True
 ignore_missing_imports = True
 strict_optional = False
 explicit_package_bases = True
-exclude = face_swapper/LivePortrait

requirements.txt

@@ -4,3 +4,4 @@ onnx==1.17.0
 onnxruntime==1.20.0
 opencv-python==4.10.0.84
 mxnet==1.9.1
+pytorch-msssim==1.0.0