Put everything back.

ctrtool/deps/libtoolchain/include/tc/os/Environment.h

@@ -0,0 +1,28 @@
+	/**
+	 * @file Environment.h
+	 * @brief Declarations for API resources for accessing run-time environment
+	 * @author Jack (jakcron)
+	 * @version 0.1
+	 * @date 2020/06/12
+	 **/
+#pragma once
+#include <tc/types.h>
+#include <tc/ByteData.h>
+
+namespace tc { namespace os {
+
+	/**
+	 * @brief Get environment variable.
+	 * 
+	 * @details This function supports UTF-8 encoding
+	 * 
+	 * @param[in] name Name of environment variable.
+	 * @param[out] value Reference to string to populate with variable.
+	 *
+	 * @post @p value will contain the environment variable if it exists.
+	 * 
+	 * @return true if operation was successful.
+	 */
+bool getEnvVar(const std::string& name, std::string& value);
+
+}} // namespace tc::cli