decouple Command and Environment classes

alib2cli/src/command/Command.h

@@ -2,10 +2,11 @@
 #define _CLI_COMMAND_H_
 #include <command/CommandResult.h>
-#include <environment/Environment.h>
 namespace cli {
+class Environment;
+
 class Command {
 public:
 	virtual ~Command ( ) noexcept = default;

alib2cli/src/environment/Environment.h

@@ -16,6 +16,8 @@
 namespace cli {
+class Command;
+
 class Environment {
 	ext::map < std::string, std::string > m_bindings;
 	ext::map < std::string, std::shared_ptr < abstraction::Value > > m_variables;