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/lvgl-window-manager-module/source/module.cpp

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: Apache-2.0
+#include <lvgl_window_manager/module.h>
+#include <lvgl_window_manager/window_manager.h>
+
+#include <tactility/module.h>
+
+extern "C" {
+
+static const ModuleSymbol SYMBOLS[] = {
+    DEFINE_MODULE_SYMBOL(window_manager_create),
+    DEFINE_MODULE_SYMBOL(window_manager_remove),
+    DEFINE_MODULE_SYMBOL(window_manager_get_state),
+    DEFINE_MODULE_SYMBOL(window_manager_await_state_change),
+    MODULE_SYMBOL_TERMINATOR,
+};
+
+Module lvgl_window_manager_module = {
+    .name = "lvgl-window-manager",
+    .start = window_manager_start,
+    .stop = window_manager_stop,
+    .drivers = nullptr,
+    .symbols = SYMBOLS,
+    .internal = nullptr,
+};
+
+}