Fixing many Codacy nitpicks

Author: jonoomph

src/classes/thumbnail.py

@@ -79,7 +79,7 @@ def GenerateThumbnail(file_path, thumb_path, thumbnail_frame, width, height, mas
     try:
         clip = openshot.Clip(file_path)
         reader = clip.Reader()
-    except RuntimeError as ex:
+    except RuntimeError:
         # Any failure calling Reader (i.e. file missing or corrupt) use placeholder thumbnail
         not_found_path = os.path.join(info.IMAGES_PATH, "[email protected]")
         shutil.copyfile(not_found_path, thumb_path)

src/classes/timeline.py

@@ -31,7 +31,6 @@
 from classes.updates import UpdateInterface
 from classes.logger import log
 from classes.app import get_app
-from PyQt5.QtCore import QSize
 
 
 class TimelineSync(UpdateInterface):

src/windows/preview_thread.py

@@ -28,7 +28,6 @@
 import time
 import sip
 import math
-import os
 
 from PyQt5.QtCore import QObject, QThread, QTimer, pyqtSlot, pyqtSignal, QCoreApplication
 from PyQt5.QtWidgets import QMessageBox

src/windows/process_effect.py

@@ -31,12 +31,13 @@
 import functools
 import webbrowser
 
-from PyQt5.QtCore import *
-from PyQt5.QtGui import QBrush, QPainter
-from PyQt5.QtWidgets import *
+from PyQt5.QtCore import Qt, pyqtSignal, QCoreApplication
+from PyQt5.QtGui import QPainter
+from PyQt5.QtWidgets import QPushButton, QDialog, QLabel, QDoubleSpinBox, QSpinBox, QLineEdit, QCheckBox, QComboBox, QDialogButtonBox, QSizePolicy
 import openshot  # Python module for libopenshot (required video editing module installed separately)
 
-from classes import info, ui_util, qt_types, updates
+from classes import info
+from classes import ui_util
 from classes.app import get_app
 from classes.logger import log
 from classes.metrics import *