Merge develop into main (#339)

- Update ILI9341 driver to v2.0.1
- Lots of code cleanup for apps
- Refactor app "type" into "category" and added flags to the manifest (for show/hide statusbar and for hidden apps)
- Rename some ElfApp-related functionality and improved the way the static data was managed
- Rename "filebrowser" to "files"
- Added cstring functions to tt_init.cpp
- Minor fix in Boot app
- Updated external apps for SDK changes

TactilityC/Source/tt_init.cpp

@@ -90,6 +90,9 @@ const esp_elfsym elf_symbols[] {
     ESP_ELFSYM_EXPORT(strstr),
     ESP_ELFSYM_EXPORT(memset),
     ESP_ELFSYM_EXPORT(memcpy),
+    ESP_ELFSYM_EXPORT(memcmp),
+    ESP_ELFSYM_EXPORT(memchr),
+    ESP_ELFSYM_EXPORT(memmove),
     // ctype
     ESP_ELFSYM_EXPORT(isalnum),
     ESP_ELFSYM_EXPORT(isalpha),