Support GPIO app in vertical orientation (#129)

... and fix getting proper display in Display app

Documentation/ideas.md

@@ -22,7 +22,6 @@
 - Show a warning screen if firmware encryption or secure boot are off when saving WiFi credentials.
 - Show a warning screen when a user plugs in the SD card on a device that only supports mounting at boot.
 - Localisation of texts (load in boot app from sd?)
-- Portrait support for GPIO app
 - Explore LVGL9's FreeRTOS functionality
 - Explore LVGL9's ILI93414 driver for 2.4" Yellow Board
 - Replace M5Unified and M5GFX with custom drivers (so we can fix the Core2 SD card mounting bug, and so we regain some firmware space)

Tactility/Source/app/display/Display.cpp

@@ -94,7 +94,7 @@ static void onShow(AppContext& app, lv_obj_t* parent) {
     lv_slider_set_range(brightness_slider, 0, 255);
     lv_obj_add_event_cb(brightness_slider, onSliderEvent, LV_EVENT_VALUE_CHANGED, nullptr);
 
-    auto* lvgl_display = lv_display_get_default();
+    auto* lvgl_display = lv_obj_get_display(parent);
     tt_assert(lvgl_display != nullptr);
     auto* hal_display = (tt::hal::Display*)lv_display_get_user_data(lvgl_display);
     tt_assert(hal_display != nullptr);

Tactility/Source/app/gpio/Gpio.cpp

@@ -127,9 +127,14 @@ void Gpio::onShow(AppContext& app, lv_obj_t* parent) {
     lv_obj_set_flex_grow(wrapper, 1);
     lv_obj_set_style_border_width(wrapper, 0, 0);
 
-    uint8_t column = 0;
-    uint8_t column_limit = 10;
+    auto* display = lv_obj_get_display(parent);
+    auto horizontal_px = lv_display_get_horizontal_resolution(display);
+    auto vertical_px = lv_display_get_vertical_resolution(display);
+    bool is_landscape_display = horizontal_px > vertical_px;
+
     int32_t x_spacing = 20;
+    uint8_t column = 0;
+    uint8_t column_limit = is_landscape_display ? 10 : 5;
 
     lv_obj_t* row_wrapper = createGpioRowWrapper(wrapper);
     lv_obj_align(row_wrapper, LV_ALIGN_TOP_MID, 0, 0);