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/ChangeLog.d/rename-conf-early-data-API.txt

@@ -0,0 +1,4 @@
+API changes
+   * Remove `tls13_` in mbedtls_ssl_tls13_conf_early_data() and
+     mbedtls_ssl_tls13_conf_max_early_data_size() API names. Early data
+     feature may not be TLS 1.3 specific in the future. Fixes #6909.