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/crl-ec-sha256.pem

@@ -0,0 +1,10 @@
+-----BEGIN X509 CRL-----
+MIIBcTCB9wIBATAKBggqhkjOPQQDAjA+MQswCQYDVQQGEwJOTDERMA8GA1UECgwI
+UG9sYXJTU0wxHDAaBgNVBAMME1BvbGFyc3NsIFRlc3QgRUMgQ0EXDTIzMDUxNzA3
+MTQ0MFoXDTMzMDUxNzA3MTQ0MFowFDASAgEKFw0yMzA1MTcwNzE0NDBaoHIwcDBu
+BgNVHSMEZzBlgBSdbSAkSQE/K8t4tRm8fiTJ2/s2fKFCpEAwPjELMAkGA1UEBhMC
+TkwxETAPBgNVBAoMCFBvbGFyU1NMMRwwGgYDVQQDDBNQb2xhcnNzbCBUZXN0IEVD
+IENBggkAwUPifmJDzOgwCgYIKoZIzj0EAwIDaQAwZgIxAOFCq4tS7s27+KShmh4n
+zavpLBQUbqyjkH9dJk0jg862YXjirOu9oCOoWtZQz6/LhQIxAJbtOSwJNq0F/FTq
+NYhP7ibE1jad9Tbs6igtZ7Z9NN7V5upnnL4SVETU9pvy9zh+tw==
+-----END X509 CRL-----