Move redist tools to central location (#334)

* Move redist tools to central location

* Include exe and dll in package setup

tools/isledecomp/isledecomp/lib/__init__.py

@@ -0,0 +1,13 @@
+"""Provides a reference point for redistributed tools found in this directory.
+This allows you to get the path for these tools from a script run anywhere."""
+from os.path import join, dirname
+
+
+def lib_path() -> str:
+    """Returns the directory for this module."""
+    return dirname(__file__)
+
+
+def lib_path_join(name: str) -> str:
+    """Convenience wrapper for os.path.join."""
+    return join(lib_path(), name)