Add a simple generic conanfile.py which can be used for nc projects

This script will automatically load conanfile.txt from well known
locations (assuming it follows the standard  project structure).

conanfile.py

@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+
+"""
+This is a master conanfile.py which can be symlinked into a root directory and automatically discover conanfile.txt
+from child packages from nerdcruft. (ie, from the glob cruft/*/conanfile.txt).
+
+It also looks for a file _conanfile.txt in the same directory as this script. This config is loaded at the end and so
+its [options] section will override any other options present in the defaults, or child packages.,
+"""
+
+
+from conans.client.loader_txt import ConanFileTextLoader
+from conans.model.options import Options
+
+from conan import ConanFile
+from conan.tools.files import copy
+
+import os
+import glob
+
+
+def slurp(path: str) -> str:
+    with open(path, 'rt') as f:
+        return f.read()
+
+
+# Load all the conanfile.txt of submodules
+dirname = os.path.abspath(os.path.dirname(__file__))
+print(dirname)
+
+subpackages = [
+    ConanFileTextLoader(slurp(i))
+    for i in glob.glob(
+        os.path.join(
+            dirname, 'cruft', "*", 'conanfile.txt')
+    )
+]
+
+# Attempt to load a conanfile.txt in the root directory too.
+try:
+    subpackages.append(
+        ConanFileTextLoader(
+            slurp(os.path.join(dirname, '_conanfile.txt'))
+        )
+    )
+except FileNotFoundError:
+    pass
+
+# Combine all the options and requirements
+_opt = Options()
+for i in subpackages:
+    _opt.update_options(Options.loads(i.options))
+_opt = _opt.serialize()
+
+_requirements = tuple(j for i in subpackages for j in i.requirements)
+
+
+class RootConan(ConanFile):
+    name = 'cruft-root'
+    version = '0.1'
+
+    settings = "os", "compiler", "build_type", "arch"
+
+    requires = _requirements
+
+    tool_requires = (
+        'cmake/[>=3.23]'
+    )
+
+    generators = 'CMakeDeps', 'CMakeToolchain'
+
+    default_options = {'*:shared': True} | _opt
+
+    LIB_PATTERNS = (
+        "*.dylib",
+        "*.dll",
+        "*.dll.a",
+        "*.so",
+        "*.so.*",
+    )
+
+    # Conan2 doesn't have a "deploy" function.
+    #
+    # For the time being use this post-processing step to emulate it.
+    def generate(self):
+        for dep in self.dependencies.values():
+            deps_dir = f"{self.build_folder}/deps"
+            for src_dir in dep.cpp_info.libdirs + dep.cpp_info.bindirs:
+                for pattern in self.LIB_PATTERNS:
+                    copy(self, pattern, src_dir, deps_dir)