added display and its subclasses

src/curses_output.cc

@@ -0,0 +1,22 @@
+#include "curses_output.h"
+
+curses_output::curses_output(std::unique_ptr<cursor> &new_curse):
+        curse{new_curse} {}
+
+void curses_output::render() {
+        curse->show();
+}
+
+void curses_output::clear() {
+        curse->clear();
+}
+
+void curses_output::print_char(const position &pos, const char ch,
+                               const int attr) {
+        curse->print_char(pos, ch, attr);
+}
+
+void curses_output::print_str(const position &pos, const std::string &str,
+                              const int attr) {
+        curse->print_str(pos, str, attr);
+}