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/format_gen.pub

@@ -0,0 +1,6 @@
+-----BEGIN PUBLIC KEY-----
+MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDA0UszjREl+JklUyevaN8fb0Gp
+13Dzb4pY3MCoJK15BWoeoUFAIVvuI0C8bRm/i1OO4BN9tSRrRjW+S89YbYy1C73P
+UgKZSejjnEFA4chcSOKOhZlM6K7+Pcrcx+sdiDu1DheODMiSFhoxt+H6IUvBEGkI
+5AWFu5MDP7wlU/AZfQIDAQAB
+-----END PUBLIC KEY-----