Refactor compilation signals and UI communication

- Moved CompilationSignals and MainProcessSignals classes from Core/Compiler to Ui/Gui/Dialogs/CompilerDialog.py for better organization and separation of concerns.
- Updated imports in Core/__init__.py and Ui/Gui/Gui.py to reflect the new location of the signal classes.
- Adjusted signal connections in the compilation process to ensure proper communication between the UI and the compilation backend.

Author: raidos23