Creating generic term renderer.

src/platform/platform.h

@@ -8,15 +8,23 @@
 #pragma once
 #include "microrpg.h"
 
+#define PLATFORM_OK 0
+#define PLATFORM_EXIT 1
+#define PLATFORM_ERROR 2
+
 /**
  * Initialize the platform-specific subsystem.
+ * 
+ * @return 0 on success, non-zero on failure.
  */
-void platformInit(void);
+uint8_t platformInit(void);
 
 /**
  * Update the platform-specific subsystem.
+ * 
+ * @return 0 to continue, 1 to exit, anything else for error.
  */
-void platformUpdate(void);
+uint8_t platformUpdate(void);
 
 /**
  * Render the platform-specific subsystem.