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.

Tactility/Source/Main.cpp

@@ -0,0 +1,15 @@
+#include <Tactility/Tactility.h>
+
+#include <devicetree.h>
+
+#ifndef ESP_PLATFORM
+#include <Simulator.h>
+#endif
+
+extern "C" {
+
+void app_main() {
+    tt::run(dts_modules, dts_devices);
+}
+
+} // extern