WIP Show Track Info: Select on tag opens it in full screen

Mostly useful for reading comments

WIP as it currently works only from WPS. Doesn't work from file browser(see https://gerrit.rockbox.org/r/c/rockbox/+/5999). Also breaks playlist viewer if called from there. Not sure how to handle it properly in all cases and not currently planning to work on it

Change-Id: I441eb9c6b3fe50f58436111d83bc98a25841d656

apps/plugins/CATEGORIES

@@ -207,3 +207,4 @@ xobox,games
 xrick,games
 xworld,games
 zxbox,viewers
+view_text,viewers

apps/plugins/SOURCES

@@ -32,6 +32,7 @@ settings_dumper.c
 snow.c
 sort.c
 stats.c
+view_text.c
 #ifdef HAVE_TOUCHSCREEN
 stopwatch.lua
 #else

apps/plugins/SOURCES.app_build

@@ -12,6 +12,7 @@ search.c
 sort.c
 theme_remove.c
 vbrfix.c
+view_text.c
 #if PLUGIN_BUFFER_SIZE >= 0x80000
 boomshine.lua
 stopwatch.lua

apps/plugins/view_text.c

@@ -0,0 +1,35 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 Björn Stenberg
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+/* welcome to the example rockbox plugin */
+
+/* mandatory include for all plugins */
+#include "plugin.h"
+#include "lib/simple_viewer.h"
+
+/* this is the plugin entry point */
+enum plugin_status plugin_start(const void* parameter)
+{
+    
+    char** title_and_text = (char**)parameter;
+    view_text(title_and_text[0], title_and_text[1]);
+    return PLUGIN_OK;
+}

apps/screens.c

@@ -55,6 +55,7 @@
 #include "replaygain.h"
 
 #include "ctype.h"
+#include "plugin.h"
 
 #if CONFIG_CHARGING
 void charging_splash(void)
@@ -815,7 +816,19 @@ refresh_info:
         if(!list_do_action(CONTEXT_LIST,HZ/2, &id3_lists, &key)
            && key!=ACTION_NONE && key!=ACTION_UNKNOWN)
         {
-            if (key == ACTION_STD_OK || key == ACTION_STD_CANCEL)
+            if (key == ACTION_STD_OK)
+            {
+                int header_id = id3_headers[info.info_id[id3_lists.selected_item/2]];
+                char* title_and_text[2];
+                title_and_text[0] = str(header_id);
+
+                char buffer[MAX_PATH];
+                title_and_text[1] = (char*)id3_get_or_speak_info(id3_lists.selected_item+1,&info, buffer, sizeof(buffer), false);
+                plugin_load(VIEWERS_DIR"/view_text.rock", title_and_text);
+                gui_synclist_draw(&id3_lists);
+                continue;
+            }
+            if (key == ACTION_STD_CANCEL)
             {
                 ret = false;
                 break;