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).

tests/test_generate_scr.py

@@ -0,0 +1,44 @@
+from pathlib import Path
+from tasks.generate_scr import generate_scr
+
+
+def write_file(path: Path, content: str):
+    path.write_text(content.strip(), encoding="utf-8")
+
+
+def test_generate_scr_basic(tmp_path):
+    cfg_path = tmp_path / "project.cfg"
+    scr_path = tmp_path / "working" / "MyProject.scr"
+
+    write_file(cfg_path, """
+        PROJECT = MyProject
+        TARGET_PART = xc3s50-4-pq208
+        XILINX = /some/path
+    """)
+
+    generate_scr(scr_path, cfg_path)
+
+    content = scr_path.read_text()
+    assert "-ifn MyProject.prj" in content
+    assert "-ofn MyProject.ngc" in content
+    assert "-top MyProject" in content
+    assert "-p xc3s50-4-pq208" in content
+
+
+def test_generate_scr_with_top_and_opts(tmp_path):
+    cfg_path = tmp_path / "project.cfg"
+    scr_path = tmp_path / "working" / "MyProject.scr"
+
+    write_file(cfg_path, """
+        PROJECT = MyProject
+        TARGET_PART = xc3s200-5-ft256
+        TOPLEVEL = TopModule
+        XST_OPTS = -opt_mode Speed -opt_level 2
+        XILINX = /some/path
+    """)
+
+    generate_scr(scr_path, cfg_path)
+
+    content = scr_path.read_text()
+    assert "-top TopModule" in content
+    assert "-opt_mode Speed -opt_level 2" in content