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/service-module/source/module.cpp

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: Apache-2.0
+#include <tactility/module.h>
+#include <service/instance.h>
+#include <service/manager.h>
+#include <service/paths.h>
+
+static const ModuleSymbol SYMBOLS[] = {
+    // service/service_instance
+    DEFINE_MODULE_SYMBOL(service_instance_construct),
+    DEFINE_MODULE_SYMBOL(service_instance_destruct),
+    DEFINE_MODULE_SYMBOL(service_instance_get_manifest),
+    DEFINE_MODULE_SYMBOL(service_instance_get_data),
+    DEFINE_MODULE_SYMBOL(service_instance_get_state),
+    // service/service_manager
+    DEFINE_MODULE_SYMBOL(service_manager_add),
+    DEFINE_MODULE_SYMBOL(service_manager_remove),
+    DEFINE_MODULE_SYMBOL(service_manager_find_manifest),
+    DEFINE_MODULE_SYMBOL(service_manager_start),
+    DEFINE_MODULE_SYMBOL(service_manager_stop),
+    DEFINE_MODULE_SYMBOL(service_manager_get_state),
+    DEFINE_MODULE_SYMBOL(service_manager_find_instance),
+    // service/service_paths
+    DEFINE_MODULE_SYMBOL(service_paths_get_user_data_directory),
+    DEFINE_MODULE_SYMBOL(service_paths_get_user_data_path),
+    DEFINE_MODULE_SYMBOL(service_paths_get_assets_directory),
+    DEFINE_MODULE_SYMBOL(service_paths_get_assets_path),
+    // terminator
+    MODULE_SYMBOL_TERMINATOR
+};
+
+Module service_module = {
+    .name = "service",
+    .start = nullptr,
+    .stop = nullptr,
+    .drivers = nullptr,
+    .symbols = SYMBOLS,
+    .internal = nullptr,
+};