Initial basic functionality commit

What this commit adds:
* Ability to apply a theme, given a folder
* Extract all .zip files in /Themes/ into a relevant folder
* Get all theme metadata from info.smdh
* Proper unicode handling

What's still needed for initial release:
* Theme shuffling
* GUI

source/main.c

@@ -0,0 +1,50 @@
+#include <3ds.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "theme.h"
+#include "unicode.h"
+
+int main(void)
+{
+	gfxInitDefault();
+	cfguInit();
+	srvInit();	
+	hidInit();
+	fsInit();	
+	ptmSysmInit();
+	consoleInit(GFX_TOP, NULL);
+
+	while (aptMainLoop())
+	{
+		hidScanInput();
+		u32 kDown = hidKeysDown();
+
+		if (kDown & KEY_A) {
+			node *first_node = malloc(sizeof(node));
+			first_node->data = NULL;
+			first_node->next = NULL;
+			prepareThemes(first_node);
+			node *current_node = first_node->next;
+    		while (current_node != NULL)
+    		{
+        		printu(current_node->data->title);
+        		current_node = current_node->next;
+    		}
+    		puts("Done!");
+		}
+		if (kDown & KEY_START)
+		{
+			closeThemeArchives();	
+			PTMSYSM_ShutdownAsync(0);
+			ptmSysmExit();
+		}
+		gfxFlushBuffers();
+		gfxSwapBuffers();
+		gspWaitForVBlank();
+	}
+
+	gfxExit();
+	return 0;
+}