added a customizable plugin system

- the base LUA functionality has been implemented as a mandatory plugin
- the jtacautolase functionality has been implemented as a plugin
- added a VEAF framework plugin

The plugins have GUI elements in the Settings window.

plugin/base_plugin.py

@@ -0,0 +1,41 @@
+from PySide2.QtCore import QSize, Qt, QItemSelectionModel, QPoint
+from PySide2.QtWidgets import QLabel, QDialog, QGridLayout, QListView, QStackedLayout, QComboBox, QWidget, \
+    QAbstractItemView, QPushButton, QGroupBox, QCheckBox, QVBoxLayout, QSpinBox
+
+class BasePlugin():
+    nameInUI:str = "Base plugin"
+    nameInSettings:str = "plugin.base"
+    enabledDefaultValue:bool = False
+
+    def __init__(self):
+        self.uiWidget: QCheckBox = None
+        self.enabled = self.enabledDefaultValue
+        self.settings = None
+
+    def setupUI(self, settingsWindow, row:int):
+        self.settings = settingsWindow.game.settings
+
+        if not self.nameInSettings in self.settings.plugins:
+            self.settings.plugins[self.nameInSettings] = self.enabledDefaultValue
+
+        self.uiWidget = QCheckBox()
+        self.uiWidget.setChecked(self.settings.plugins[self.nameInSettings])
+        self.uiWidget.toggled.connect(lambda: self.applySetting(settingsWindow))
+
+        settingsWindow.pluginsGroupLayout.addWidget(QLabel(self.nameInUI), row, 0)
+        settingsWindow.pluginsGroupLayout.addWidget(self.uiWidget, row, 1, Qt.AlignRight)
+
+    def applySetting(self, settingsWindow):
+        self.settings.plugins[self.nameInSettings] = self.uiWidget.isChecked()
+        self.enabled = self.settings.plugins[self.nameInSettings]
+   
+    def injectScripts(self, operation):
+        self.settings = operation.game.settings
+        return self.isEnabled()
+
+    def injectConfiguration(self, operation):
+        self.settings = operation.game.settings
+        return self.isEnabled()
+
+    def isEnabled(self) -> bool:
+        return self.settings != None and self.settings.plugins[self.nameInSettings]