+ rearranged files

+ improved ui log
+ added image browser
- image loading fails at the moment
- arrangement of ui in image browser not checked

main/include/sd/sd.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <stdio.h>
+
+#define MAX_SIMULTANEOUS_OPEN_FILES 2
+
+void sd_init(void);
+void sd_destroy(void);
+
+void print_sd_card_info(void);
+
+FILE* sd_open_read(const char* filename);
+FILE* sd_open_write(const char* filename);
+void sd_close_file(FILE* file);
+
+size_t sd_get_file_count(void);
+const char* sd_get_next_file(void);
+const char* sd_get_previous_file(void);