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/dir-maxpath/05.key

@@ -0,0 +1,8 @@
+-----BEGIN EC PARAMETERS-----
+BggqhkjOPQMBBw==
+-----END EC PARAMETERS-----
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIP3MTs0m9ssAAXQ94O6GYC3pckfpMUxQiPTG8hQYgA0WoAoGCCqGSM49
+AwEHoUQDQgAEBHU9DhX+RlHK4F9l5ZQsicz/eDWeOuBrIAeqbDS7A3i/o+wFPqCc
+u1S71v5R4dzg4JdPGfW4aixQZjY5x25vEA==
+-----END EC PRIVATE KEY-----