Remove TactilityC and Firmware subprojects (#638)

- Removed TactilityC, moved its symbols to existing modules and several new ones (pthread-module, c-symbols-module, cpp-symbols-module, posix-symbols-module, freertos-module).
- Removed Firmware subproject and moved main() into Tactility subproject.
- Strengthened application archive, path, version, stack-size, and device validation.
- Moved symbol resolution for elf_loader to app-esp32-module.
- Improved `struct Module` declarations and made module and symbol definitions in modules more consistent.
- Removed old http download code from Tactility subproject.
- Rename app-module's source files for consistency.
- Add missing pthread symbols.
- Kernel module symbols are now resolvable on all platforms.

Modules/app-module/source/paths.cpp

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#include <app/location.h>
+#include <app/manager.h>
+#include <app/paths.h>
+#include <tactility/paths.h>
+
+#include <cstdio>
+
+extern "C" {
+
+error_t app_paths_get_user_data_directory(const char* app_id, char* out_path, size_t out_path_size) {
+    char root[192];
+    error_t error = paths_get_data_path(root, sizeof(root));
+    if (error != ERROR_NONE) {
+        return error;
+    }
+    int written = std::snprintf(out_path, out_path_size, "%s/user/app/%s", root, app_id);
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+}
+
+error_t app_paths_get_user_data_path(const char* app_id, const char* child_path, char* out_path, size_t out_path_size) {
+    char directory[224];
+    error_t error = app_paths_get_user_data_directory(app_id, directory, sizeof(directory));
+    if (error != ERROR_NONE) {
+        return error;
+    }
+    int written = std::snprintf(out_path, out_path_size, "%s/%s", directory, child_path);
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+}
+
+error_t app_paths_get_assets_directory(const char* app_id, char* out_path, size_t out_path_size) {
+    AppManifest manifest;
+    error_t error = app_manager_find_manifest(app_id, &manifest);
+    if (error != ERROR_NONE) {
+        return error;
+    }
+
+    if (manifest.location.type != APP_LOCATION_PATH) {
+        return ERROR_NOT_FOUND;
+    }
+
+    int written = std::snprintf(out_path, out_path_size, "%s/assets", static_cast<const char*>(manifest.location.location));
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+}
+
+error_t app_paths_get_assets_path(const char* app_id, const char* child_path, char* out_path, size_t out_path_size) {
+    char directory[224];
+    error_t error = app_paths_get_assets_directory(app_id, directory, sizeof(directory));
+    if (error != ERROR_NONE) {
+        return error;
+    }
+    int written = std::snprintf(out_path, out_path_size, "%s/%s", directory, child_path);
+    if (written < 0 || (size_t)written >= out_path_size) {
+        return ERROR_BUFFER_OVERFLOW;
+    }
+    return ERROR_NONE;
+}
+
+} // extern "C"