Tactility.py 3.0.0 and SDK updates for 0.7.0-dev (#19)

- Remove `Libraries/Str`
- Replaced usage of `TactilityC` FreeRtos features with `TactilityFreeRtos` library
- Update `tactility.py`
- Removed redundant code from `TactilityCpp`

Apps/GraphicsDemo/main/CMakeLists.txt

@@ -2,6 +2,8 @@ file(GLOB_RECURSE SOURCE_FILES Source/*.c*)
 
 idf_component_register(
     SRC_DIRS "Source"
-    INCLUDE_DIRS "Include"
+    # Library headers must be included directly,
+    # because all regular dependencies get stripped by elf_loader's cmake script
+    INCLUDE_DIRS "Include" "../../../Libraries/TactilityCpp/Include"
     REQUIRES TactilitySDK
 )