Move most code from falco_init() to individual app actions

Each file below app_actions/ defines some of the methods declared in
falco::app::application.

Any state that needs to be shared betweeen methods, or between the run
and teardown methods, resides in falco::app::application::state(), so
the moved code stays pretty much as-is, other than replacing stack
variables with member variables in app_state.

Signed-off-by: Mark Stemm <mark.stemm@gmail.com>

userspace/falco/CMakeLists.txt

@@ -17,6 +17,25 @@ set(
   FALCO_SOURCES
   application.cpp
   app_cmdline_options.cpp
+  app_actions/create_signal_handlers.cpp
+  app_actions/daemonize.cpp
+  app_actions/init_falco_engine.cpp
+  app_actions/init_inspector.cpp
+  app_actions/init_outputs.cpp
+  app_actions/list_fields.cpp
+  app_actions/list_plugins.cpp
+  app_actions/load_config.cpp
+  app_actions/load_plugins.cpp
+  app_actions/load_rules_files.cpp
+  app_actions/open_inspector.cpp
+  app_actions/process_events.cpp
+  app_actions/print_help.cpp
+  app_actions/print_ignored_events.cpp
+  app_actions/print_support.cpp
+  app_actions/print_version.cpp
+  app_actions/start_grpc_server.cpp
+  app_actions/start_webserver.cpp
+  app_actions/validate_rules_files.cpp
   configuration.cpp
   logger.cpp
   falco_outputs.cpp
@@ -38,6 +57,7 @@ set(
   "${CXXOPTS_INCLUDE_DIR}"
   "${YAMLCPP_INCLUDE_DIR}"
   "${CMAKE_CURRENT_BINARY_DIR}"
+  "${CMAKE_CURRENT_SOURCE_DIR}"
   "${DRAIOS_DEPENDENCIES_DIR}/yaml-${DRAIOS_YAML_VERSION}/target/include"
 )