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

@@ -4,7 +4,7 @@
 #include <service/manager.h>
 #include <service/paths.h>
 
-const ModuleSymbol service_module_symbols[] = {
+static const ModuleSymbol SYMBOLS[] = {
     // service/service_instance
     DEFINE_MODULE_SYMBOL(service_instance_construct),
     DEFINE_MODULE_SYMBOL(service_instance_destruct),
@@ -30,7 +30,9 @@ const ModuleSymbol service_module_symbols[] = {
 
 Module service_module = {
     .name = "service",
+    .start = nullptr,
+    .stop = nullptr,
     .drivers = nullptr,
-    .symbols = service_module_symbols,
-    .internal = nullptr
+    .symbols = SYMBOLS,
+    .internal = nullptr,
 };