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.

Buildscripts/release-sdk.py

@@ -131,11 +131,6 @@ def main():
     # Mapping logic
     mappings = [
         {'src': 'version.txt', 'dst': ''},
-        # TactilityC
-        {'src': 'build/esp-idf/TactilityC/libTactilityC.a', 'dst': 'Libraries/TactilityC/binary/'},
-        {'src': 'TactilityC/Include/*', 'dst': 'Libraries/TactilityC/include/'},
-        {'src': 'TactilityC/CMakeLists.txt', 'dst': 'Libraries/TactilityC/'},
-        {'src': 'TactilityC/LICENSE*.*', 'dst': 'Libraries/TactilityC/'},
         # TactilityFreeRtos
         {'src': 'TactilityFreeRtos/Include/**', 'dst': 'Libraries/TactilityFreeRtos/Include/'},
         {'src': 'TactilityFreeRtos/CMakeLists.txt', 'dst': 'Libraries/TactilityFreeRtos/'},