Add project configuration and build tools

- Introduced new scripts for project generation and synthesis (dodo.py, generate_prj.py, generate_scr.py, run_xst.py).
- Implemented configuration parsing for VHDL sources and project settings (config.py).
- Added default configuration values (defaults.py).
- Updated .gitignore to include additional file types.
- Created test cases for project generation and configuration parsing (test_generate_prj.py, test_generate_scr.py, test_project_cfg.py).

tools/defaults.py

@@ -0,0 +1,43 @@
+# tools/defaults.py
+from typing import Dict
+
+def get_default_config() -> Dict[str, str]:
+    return {
+        "TOPLEVEL": "",  # wird dynamisch ersetzt
+        "CONSTRAINTS": "",
+        "BUILD_DIR": "working",
+        "REPORT_DIR": "reports",
+        "COMMON_OPTS": "-intstyle xflow",
+        "XST_OPTS": "",
+        "NGDBUILD_OPTS": "",
+        "MAP_OPTS": "-detail",
+        "PAR_OPTS": "",
+        "BITGEN_OPTS": "",
+        "TRACE_OPTS": "-v 3 -n 3",
+        "FUSE_OPTS": "-incremental",
+        "ISIM_OPTS": "-gui",
+        "ISIM_CMD": "",
+        "PROGRAMMER": "none",
+        "PROGRAMMER_PRE": "",
+        "IMPACT_OPTS": "-batch impact.cmd",
+        "DJTG_EXE": "djtgcfg",
+        "DJTG_DEVICE": "DJTG_DEVICE-NOT-SET",
+        "DJTG_INDEX": "0",
+        "DJTG_FLASH_INDEX": "1",
+        "XC3SPROG_EXE": "xc3sprog",
+        "XC3SPROG_CABLE": "none",
+        "XC3SPROG_OPTS": "",
+    }
+
+def with_defaults(project_cfg: Dict[str, str]) -> Dict[str, str]:
+    merged = get_default_config()
+    merged.update(project_cfg)
+
+    # Fallbacks sicherstellen (kein leerer oder None-Wert bleibt erhalten)
+    if not merged.get("TOPLEVEL"):
+        merged["TOPLEVEL"] = merged.get("PROJECT", "")
+    if not merged.get("CONSTRAINTS"):
+        merged["CONSTRAINTS"] = f"{merged.get('PROJECT', '')}.ucf"
+
+    # Alle Felder final auf gültigen string casten (zur Sicherheit)
+    return {k: (v if isinstance(v, str) else str(v)) for k, v in merged.items()}