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/crl.pem

@@ -0,0 +1,11 @@
+-----BEGIN X509 CRL-----
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+pSVGVIJftDzE+33mUundQMYz4wN4QJFGRSfHW745iowF9ejiPsfAn4gO9eLDrRmA
+C0oedNyRLj6jfGRtaQddlCjCAGwNlIJBe/IhixafW9g8deGPHJu8RSlJ/Q77pgjx
+7WccwCz+dWP+uqi8fwgerHYdTjiAvFVu1Yd4KA5WTndzI3wzJwbdZZ08OfDLmyU=
+-----END X509 CRL-----