Add files for more standardized build tools

- Prior investigation into linux packaging (not using pyinstaller) suggested
having setuptools files could make packaging easier and automatable
- Add setup.cfg and setup.py as initial starting point
- Add MANIFEST.in (at least temporarily)

Currently with the python build module this almost works for main application.
It does not include all the extra data files right now.

setup.py

@@ -0,0 +1,29 @@
+from setuptools import setup, Extension
+from pathlib import Path
+
+exts = [
+    Extension(
+        "_block",
+        [
+            str(Path("core", "pe", "modules", "block.c")),
+            str(Path("core", "pe", "modules", "common.c")),
+        ],
+        include_dirs=[str(Path("core", "pe", "modules"))],
+    ),
+    Extension(
+        "_cache",
+        [
+            str(Path("core", "pe", "modules", "cache.c")),
+            str(Path("core", "pe", "modules", "common.c")),
+        ],
+        include_dirs=[str(Path("core", "pe", "modules"))],
+    ),
+    Extension("_block_qt", [str(Path("qt", "pe", "modules", "block.c"))]),
+]
+
+headers = [str(Path("core", "pe", "modules", "common.h"))]
+
+setup(
+    ext_modules=exts,
+    headers=headers,
+)