move open_folder, open_url from core to app

res/layouts/pages/content.xml

@@ -15,7 +15,7 @@
         <textbox id='search_textbox' multiline='false' size='440,25' sub-consumer='function(x) refresh_search() end'></textbox>  
     </panel>  
   
-    <image onclick='core.open_folder("user:content")' interactive='true' src='gui/folder_icon'   
+    <image onclick='app.open_folder("user:content")' interactive='true' src='gui/folder_icon'   
         size='32' margin='0,0,18,66' gravity='bottom-right'  
         color='#FFFFFF50' hover-color='#FFFFFF10'/>  
   

res/layouts/pages/content_menu.xml

@@ -9,7 +9,7 @@
         <textbox id='search_textbox' multiline='false' size='440,25' sub-consumer='function(x) refresh_search() end'></textbox>
     </panel>
 
-    <image onclick='core.open_folder("user:content")' interactive='true' src='gui/folder_icon' 
+    <image onclick='app.open_folder("user:content")' interactive='true' src='gui/folder_icon' 
         size='32' margin='0,0,10,15' gravity='bottom-right'
         color='#FFFFFF50' hover-color='#FFFFFF10'/>
 

res/layouts/pages/settings.xml

@@ -10,7 +10,7 @@
 
     <panel margin='6' gravity='bottom-left' size='250' color='0' interval='1'>
         <button onclick='menu.page="languages"' id='langs_btn'>-</button>
-        <button onclick='core.open_folder("user:")'>@Open data folder</button>
+        <button onclick='app.open_folder("user:")'>@Open data folder</button>
 		<button id='s_rst' onclick='sections:set("reset")'>@Reset settings</button>
         <button onclick='menu:back()'>@Back</button>
     </panel>

res/layouts/pages/worlds.xml

@@ -3,6 +3,6 @@
     
     <panel id='worlds' size='390,1' padding='5' color='#FFFFFF11' max-length='400'>
     </panel>
-    <button pos='485,525' size='500,40' onclick='core.open_folder("user:worlds")'>@Open worlds folder</button>
+    <button pos='485,525' size='500,40' onclick='app.open_folder("user:worlds")'>@Open worlds folder</button>
     <button onclick='menu:back()'>@Back</button>
 </panel>

src/logic/scripting/lua/libs/libapp.cpp

@@ -9,7 +9,12 @@
 #include "devtools/Project.hpp"
 #include "network/Network.hpp"
 #include "util/platform.hpp"
+#include "util/stringutil.hpp"
 #include "window/Window.hpp"
+#include "frontend/locale.hpp"
+#include "graphics/ui/GUI.hpp"
+#include "graphics/ui/gui_util.hpp"
+#include "graphics/ui/elements/Menu.hpp"
 
 using namespace scripting;
 
@@ -102,6 +107,29 @@ static int l_set_title(lua::State* L) {
     return 0;
 }
 
+static int l_open_folder(lua::State* L) {
+    platform::open_folder(io::resolve(lua::require_string(L, 1)));
+    return 0;
+}
+
+static int l_open_url(lua::State* L) {
+    auto url = lua::require_string(L, 1);
+
+    std::wstring msg = langs::get(L"Are you sure you want to open the link:") +
+                       L"\n" + util::str2wstr_utf8(url) +
+                       std::wstring(L"?");
+
+    auto menu = engine->getGUI().getMenu();
+
+    guiutil::confirm(*engine, msg, [url, menu]() {
+        platform::open_url(url);
+        if (!menu->back()) {
+            menu->reset();
+        }
+    });
+    return 0;
+}
+
 const luaL_Reg applib[] = {
     {"start_debug_instance", lua::wrap<l_start_debug_instance>},
     {"focus", lua::wrap<l_focus>},
@@ -110,6 +138,8 @@ const luaL_Reg applib[] = {
     {"set_content_sources", lua::wrap<l_set_content_sources>},
     {"reset_content_sources", lua::wrap<l_reset_content_sources>},
     {"set_title", lua::wrap<l_set_title>},
+    {"open_folder", lua::wrap<l_open_folder>},
+    {"open_url", lua::wrap<l_open_url>},
     // for other functions see libcore.cpp and stdlib.lua
     {nullptr, nullptr}
 };

src/logic/scripting/lua/libs/libcore.cpp

@@ -20,11 +20,6 @@
 #include "util/platform.hpp"
 #include "world/Level.hpp"
 #include "world/generator/WorldGenerator.hpp"
-#include "util/platform.hpp"
-#include "frontend/locale.hpp"
-#include "graphics/ui/gui_util.hpp"
-#include "graphics/ui/GUI.hpp"
-#include "graphics/ui/elements/Menu.hpp"
 #include "window/Window.hpp"
 
 using namespace scripting;
@@ -240,29 +235,6 @@ static int l_get_setting_info(lua::State* L) {
     throw std::runtime_error("unsupported setting type");
 }
 
-static int l_open_folder(lua::State* L) {
-    platform::open_folder(io::resolve(lua::require_string(L, 1)));
-    return 0;
-}
-
-static int l_open_url(lua::State* L) {
-    auto url = lua::require_string(L, 1);
-
-    std::wstring msg = langs::get(L"Are you sure you want to open the link:") +
-                       L"\n" + util::str2wstr_utf8(url) +
-                       std::wstring(L"?");
-
-    auto menu = engine->getGUI().getMenu();
-
-    guiutil::confirm(*engine, msg, [url, menu]() {
-        platform::open_url(url);
-        if (!menu->back()) {
-            menu->reset();
-        }
-    });
-    return 0;
-}
-
 /// @brief Quit the game
 static int l_quit(lua::State*) {
     engine->quit();
@@ -317,8 +289,6 @@ const luaL_Reg corelib[] = {
     {"set_setting", lua::wrap<l_set_setting>},
     {"str_setting", lua::wrap<l_str_setting>},
     {"get_setting_info", lua::wrap<l_get_setting_info>},
-    {"open_folder", lua::wrap<l_open_folder>},
-    {"open_url", lua::wrap<l_open_url>},
     {"quit", lua::wrap<l_quit>},
     {"capture_output", lua::wrap<l_capture_output>},
     {nullptr, nullptr}