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_384_prv.comp.pem

@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHQCAQEEMD9djZvigLVpbMXMn5TPivfmth3WWSsqsrOkxgdFBBfsMn3Nyu18EAU9
+cZoFdPCnaqAHBgUrgQQAIqE0AzIAA9nGYrULopykeZBFDgQ66vTwxpsVZ20RL2Iq
+cckwWa+ZlpHFaA0rRNERV52xL0pBOg==
+-----END EC PRIVATE KEY-----