app-module events & callstack config, crash diagnostics (#630)

- Apps can specify task stack depth and preferred memory placement in their manifests.
- App identifiers are validated against length and character requirements.
- Crash diagnostics now show the crash cause, reason, fault address, call stack, and program-counter details, with logs saved for review.
- App closing is more consistent across built-in screens. There's now a dedicated function, and the old _emit() function is made private.
- Crash diagnostics no longer display a QR code without a call stack.
- Improved memory allocation for unrestricted requests.

Modules/app-module/source/manifest.cpp

@@ -0,0 +1,15 @@
+#include <app/manifest.h>
+#include <app/private/metadata_parsing_internal.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern "C" {
+
+bool app_id_is_valid(const char* id) {
+    auto size = strlen(id);
+    return size >= 5 && size <= APP_ID_LENGTH && app_metadata_validate_string(id, [](char c) {
+        return std::isalnum(static_cast<unsigned char>(c)) != 0 || c == '.';
+    });
+}
+
+}