broke classes down into own files, preparing to change model to pass by reference with int return type for almost everything

src/loaders/Unit.cpp

@@ -0,0 +1,53 @@
+#include "Unit.h"
+
+Unit::Unit( Json::Value loader_root )
+/*
+ * Constructor for Unit type.  Receives a UnitHolder loader_root.
+ */
+{
+    this->name      = loader_root.get("name", "?").asString();
+    this->target    = loader_root.get("target", "?").asString();
+    this->output    = loader_root.get("output", "?").asString();
+    this->rectifier = loader_root.get("rectifier", "?").asString();
+    this->active    = loader_root.get("active", "?").asString();
+    this->required  = loader_root.get("required", "?").asString();
+    this->rectify   = loader_root.get("rectify", "?").asString();
+}
+
+/*
+ * getters for Unit type.
+ */
+std::string Unit::get_name()
+{
+    return this->name;
+}
+
+std::string Unit::get_target()
+{
+    return this->target;
+}
+
+std::string Unit::get_output()
+{
+    return this->output;
+}
+
+std::string Unit::get_rectifier()
+{
+    return this->rectifier;
+}
+
+std::string Unit::get_active()
+{
+    return this->active;
+}
+
+std::string Unit::get_required()
+{
+    return this->required;
+}
+
+std::string Unit::get_rectify()
+{
+    return this->rectify;
+}