Time & date, system events and much more (#152)

## Time & Date
- Added time to statusbar widget
- Added Time & Date Settings app
- Added TimeZone app for selecting TimeZone
- Added `tt::time` namespace with timezone code

## Other changes

- Added `SystemEvent` to publish/subscribe to system wide (e.g. for init code, but also for time settings changes)
- Changed the way the statusbar widget works: now there's only 1 that gets shown/hidden, instead of 1 instance per app instance.
- Moved `lowercase()` function to new namespace: `tt::string`
- Increased T-Deck flash & PSRAM SPI frequencies to 120 MHz (from 80 MHz)
- Temporary work-around (+ TODO item) for LVGL stack size (issue with WiFi app)
- Suppress T-Deck keystroke debugging to debug level (privacy issue)
- Improved SDL dependency wiring in various `CMakeLists.txt`
- `Loader` service had some variables renamed to the newer C++ style (from previous C style)

TactilityHeadless/CMakeLists.txt

@@ -6,7 +6,7 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 if (DEFINED ENV{ESP_IDF_VERSION})
     file(GLOB_RECURSE SOURCE_FILES Source/*.c*)
 
-    list(APPEND REQUIRES_LIST TactilityCore esp_wifi nvs_flash driver spiffs vfs fatfs)
+    list(APPEND REQUIRES_LIST TactilityCore esp_wifi nvs_flash driver spiffs vfs fatfs lwip)
     if("${IDF_TARGET}" STREQUAL "esp32s3")
         list(APPEND REQUIRES_LIST esp_tinyusb)
     endif()