Several improvements (#9)

* fix icon filename

* update pp2d to fix preview problem

* several improvements:
- rely on a single header for simple/common headers
- cleaned up main by putting the interface drawing function in its own file
- load previews from .zip themes (may cause some loading times when launching
- only need 1 shuffle image thanks to pp2d's blending abilities

* not needed anymore

* fix preview color and position

* forgot

* add proper icon loading
thanks steveice10 for bannertool which this was pretty much taken from

* only add proper themes to the list

* add slightly more space between the icon and the name

* not monospace, the little movement every blink is annoying

* fix typo

include/themes.h

@@ -27,26 +27,27 @@
 #ifndef THEMES_H
 #define THEMES_H
 
-#include <3ds.h>
-
-#define TEX_COUNT   3
+#include "common.h"
 
 typedef struct {
-    u16 name[0x40];
-    u16 desc[0x80];
-    u16 author[0x40];
-    char icon_data[0x1200];
+    u16 name[0x80];
+    u16 desc[0x100];
+    u16 author[0x80];
+    
+    bool has_icon;
+    ssize_t icon_id;
+    
+    bool has_preview;
+    ssize_t preview_id;
+    
     u16 path[262];
     bool is_zip;
-    bool selected;
-    ssize_t preview_id;
-    bool has_preview;
-    char preview_path[0x106];
-} theme;
+    
+    bool in_shuffle;
+} Theme_s;
 
-void parse_smdh(theme *entry, u16 *path);
-int scan_themes(theme **themes, int num_themes);
-Result single_install(theme);
-Result shuffle_install(theme **themes_list, int num_themes);
+Result get_themes(Theme_s **themes_list, int *theme_count);
+Result single_install(Theme_s theme);
+Result shuffle_install(Theme_s *themes_list, int theme_count);
 
 #endif