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

libs/mbedtls/tests/data_files/ec_bp384_pub.pem

@@ -0,0 +1,5 @@
+-----BEGIN PUBLIC KEY-----
+MHowFAYHKoZIzj0CAQYJKyQDAwIIAQELA2IABHGfnQk6Yn4NNQOFxmHOvwDGGSNW
+b+kAajEHrx2HG8a7aJhf1yLqMr4xb454O3zRlXeF9mz8DLGV3VyZqOerqoSFU6WE
+39K0jnbURf4A3YvlkJbYd9RpbSO0vI2xRyTmag==
+-----END PUBLIC KEY-----