Compiler warning cleanup (#113)

Cleanup + expose more methods for external ELFs

TactilityCore/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.20)
 
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -13,6 +13,10 @@ if (DEFINED ENV{ESP_IDF_VERSION})
     )
 
     add_definitions(-DESP_PLATFORM)
+
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+        target_compile_options(${COMPONENT_LIB} PUBLIC -Wno-unused-variable)
+    endif()
 else()
     file(GLOB_RECURSE SOURCES "Source/*.c*")
     file(GLOB_RECURSE HEADERS "Source/*.h*")