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_prv.pem

@@ -0,0 +1,6 @@
+-----BEGIN EC PRIVATE KEY-----
+MIGoAgEBBDA92S51DZDX05/BiFzYrRLqlEHyK5M0tNllICrbFEjOJMWAioXdmvwi
+mvCjEk91W8ugCwYJKyQDAwIIAQELoWQDYgAEcZ+dCTpifg01A4XGYc6/AMYZI1Zv
+6QBqMQevHYcbxrtomF/XIuoyvjFvjng7fNGVd4X2bPwMsZXdXJmo56uqhIVTpYTf
+0rSOdtRF/gDdi+WQlth31GltI7S8jbFHJOZq
+-----END EC PRIVATE KEY-----