Merge pull request #54 from AntelopeIO/sbailey/update_main_help

Add `--help-all` flag and make top level help consistent with periods.

tools/main.cpp

@@ -57,13 +57,17 @@ int main(int argc, char** argv) {
 
  CLI::App app{"Antelope Smart Contract Project Management Tool", app_name};
 
+ // Explicit help flags:
+ app.set_help_flag("-h,--help","Print this help message and exit.");
+ app.set_help_all_flag("--help-all","Expanded help with subcomands.");
+
  // Add version flag with callback here.
  app.add_flag_callback("-V,--version",
  [&app]() {
  std::cout << app.get_name() << " v" << antler::system::version::full() << std::endl;
  std::exit(0); // Successful exit MUST happen here.
  },
- "get the version of antler-proj");
+ "Get the version of antler-proj.");
 
  runner<antler::add_to_project,
  antler::build_project,