Support for PC platform (#12)

* improvements for cross-platform compiling

* moved tactility-core to libs/

* splitup improvements

* remove git/gitmodules from freertos

* better platformbetter platform checks

* added build scripts

* delete mbedtls

* re-add mbedtls

* fixes and improvements

* added pc build

* simplify build scripts

* revert build scrpit

* updated builds

* fix for pc

* fix for pc

* fix for build

.gitignore

@@ -2,6 +2,7 @@
 .DS_Store
 
 build/
+build-sim/
 cmake-build-debug/
 cmake-build-release/
 CMakeCache.txt