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/module.cpp

@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: Apache-2.0
+#include <app/event.h>
+#include <app/install.h>
+#include <app/manager.h>
+#include <app/manifest.h>
+#include <app/metadata.h>
+#include <app/paths.h>
+#include <app/scheduler.h>
+
+#include <service/manager.h>
+
+#include <tactility/concurrent/task_event_group.h>
+#include <tactility/error.h>
+#include <tactility/module.h>
+
+extern "C" {
+
+extern ServiceManifest app_internal_loader_service_manifest;
+
+static const ModuleSymbol SYMBOLS[] = {
+    // app/event
+    DEFINE_MODULE_SYMBOL(app_event_subscribe),
+    DEFINE_MODULE_SYMBOL(app_event_subscribe_with_app_id),
+    DEFINE_MODULE_SYMBOL(app_event_unsubscribe),
+    DEFINE_MODULE_SYMBOL(app_event_poll),
+    // app/install
+    DEFINE_MODULE_SYMBOL(app_get_install_path),
+    DEFINE_MODULE_SYMBOL(app_install),
+    DEFINE_MODULE_SYMBOL(app_uninstall),
+    // app/manager
+    DEFINE_MODULE_SYMBOL(app_manager_start),
+    DEFINE_MODULE_SYMBOL(app_manager_start_with_parameters),
+    DEFINE_MODULE_SYMBOL(app_manager_start_for_result),
+    DEFINE_MODULE_SYMBOL(app_manager_stop),
+    DEFINE_MODULE_SYMBOL(app_manager_get_state),
+    DEFINE_MODULE_SYMBOL(app_manager_find_manifest),
+    DEFINE_MODULE_SYMBOL(app_manager_for_each_manifest),
+    DEFINE_MODULE_SYMBOL(app_manager_add),
+    DEFINE_MODULE_SYMBOL(app_manager_remove),
+    DEFINE_MODULE_SYMBOL(app_manager_get_topmost_instance_id),
+    DEFINE_MODULE_SYMBOL(app_manager_get_topmost_app_id),
+    DEFINE_MODULE_SYMBOL(app_manager_install_path_add),
+    DEFINE_MODULE_SYMBOL(app_manager_install_path_scan),
+    DEFINE_MODULE_SYMBOL(app_manager_install_path_uninstall),
+    // app/manifest
+    DEFINE_MODULE_SYMBOL(app_id_is_valid),
+    // app/metadata
+    DEFINE_MODULE_SYMBOL(app_metadata_parse),
+    // app/paths
+    DEFINE_MODULE_SYMBOL(app_paths_get_user_data_directory),
+    DEFINE_MODULE_SYMBOL(app_paths_get_user_data_path),
+    DEFINE_MODULE_SYMBOL(app_paths_get_assets_directory),
+    DEFINE_MODULE_SYMBOL(app_paths_get_assets_path),
+    // app/scheduler
+    DEFINE_MODULE_SYMBOL(app_scheduler_current_app_id),
+    // terminator
+    MODULE_SYMBOL_TERMINATOR,
+};
+
+static error_t start() {
+    return service_manager_add(&app_internal_loader_service_manifest, /*auto_start=*/true);
+}
+
+static error_t stop() {
+    return service_manager_remove(app_internal_loader_service_manifest.id);
+}
+
+Module app_module = {
+    .name = "app",
+    .start = start,
+    .stop = stop,
+    .drivers = nullptr,
+    .symbols = SYMBOLS,
+    .internal = nullptr,
+};
+
+}