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/server5.key.enc

@@ -0,0 +1,8 @@
+-----BEGIN EC PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-256-CBC,69FEA263918128D4DD673B2732E2D7EC
+
++Q4P1nVcfGoittxagWHvyBLVPbhjmTA/SZ6W5TB+5scOzgfRlcse4jIII899EQxx
+HrfhgQwzQ12TgTZ2Y8neI+RsUqFLTLinvd8c/luBKLeDECjjhyBXOJic2dRPUaLQ
+Nyg3bI0Srr6aq6nETjh8i+dSzE/wjyNzXBMdN3KhOjE=
+-----END EC PRIVATE KEY-----