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.ku-crt.crt

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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=
+-----END CERTIFICATE-----