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_bp512_pub.pem

@@ -0,0 +1,6 @@
+-----BEGIN PUBLIC KEY-----
+MIGbMBQGByqGSM49AgEGCSskAwMCCAEBDQOBggAEOLfskrYcXGx/vCik7HWdSPzU
+4uN03v1cSWilTb73UQ5ReIb7/DjqOapSk1nXCnFWw108usfOd2vbJR3WS85xI0Qk
+7nBJ7tBy8NvE15mW4XXVV+JjdjrpcJXAgec+fbLjitw9TJoEh7Ht6HbcH8phyQLp
+odhyK4YSko8YokhFWRo=
+-----END PUBLIC KEY-----