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/13.key

@@ -0,0 +1,8 @@
+-----BEGIN EC PARAMETERS-----
+BggqhkjOPQMBBw==
+-----END EC PARAMETERS-----
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIKb966FXMh8cFQt3sVpmcrh2/3yaGiLMwz+/XGKGMJ+2oAoGCCqGSM49
+AwEHoUQDQgAE65MwiS854ZYZ7L9UVwfZH3mg/nCK7j0NHCLQQxqXbw/MWwVb0HIu
+PkRtkVVAklkYZBWI0rFEjNEBzEJwRZYcNg==
+-----END EC PRIVATE KEY-----