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/test-ca2.key.enc

@@ -0,0 +1,9 @@
+-----BEGIN EC PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: DES-EDE3-CBC,307EAB469933D64E
+
+IxbrRmKcAzctJqPdTQLA4SWyBYYGYJVkYEna+F7Pa5t5Yg/gKADrFKcm6B72e7DG
+ihExtZI648s0zdYw6qSJ74vrPSuWDe5qm93BqsfVH9svtCzWHW0pm1p0KTBCFfUq
+UsuWTITwJImcnlAs1gaRZ3sAWm7cOUidL0fo2G0fYUFNcYoCSLffCFTEHBuPnagb
+a77x/sY1Bvii8S9/XhDTb6pTMx06wzrm
+-----END EC PRIVATE KEY-----