Formalize chirpc a bit and install it

This moves chirpc into a package called chirp.cli and makes setup.py
install it as a binary. This will make it available to people that
install the package and also makes it possible to add tests.

Tangentially related to #10263

chirp/cli/main.py

@@ -94,7 +94,7 @@ def parse_memory_number(radio, args):
     return memnum
 
 
-if __name__ == "__main__":
+def main():
     parser = argparse.ArgumentParser()
     logger.add_version_argument(parser)
     parser.add_argument("-s", "--serial", dest="serial",

setup.py

@@ -23,6 +23,7 @@ setup(name='chirp',
           'wx': ['wxPython'],
       },
       entry_points={
-          'console_scripts': ["chirp=chirp.wxui:chirpmain"],
+          'console_scripts': ["chirp=chirp.wxui:chirpmain",
+                              "chirpc=chirp.cli.main:main"],
       },
       )