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-sha1.pem

@@ -0,0 +1,10 @@
+-----BEGIN X509 CRL-----
+MIIBbjCB9gIBATAJBgcqhkjOPQQBMD4xCzAJBgNVBAYTAk5MMREwDwYDVQQKDAhQ
+b2xhclNTTDEcMBoGA1UEAwwTUG9sYXJzc2wgVGVzdCBFQyBDQRcNMjMwNTE3MDcx
+NDM5WhcNMzMwNTE3MDcxNDM5WjAUMBICAQoXDTIzMDUxNzA3MTQzOVqgcjBwMG4G
+A1UdIwRnMGWAFJ1tICRJAT8ry3i1Gbx+JMnb+zZ8oUKkQDA+MQswCQYDVQQGEwJO
+TDERMA8GA1UECgwIUG9sYXJTU0wxHDAaBgNVBAMME1BvbGFyc3NsIFRlc3QgRUMg
+Q0GCCQDBQ+J+YkPM6DAJBgcqhkjOPQQBA2gAMGUCMQCRAtXd7kXgijlMXHXr6m0B
+IzDbpAAwDwCJtgOzarF5hZKGDZeDp6vptGZK0y40NsoCMACxRrXIV+6KUBipFarI
+36yXDoBNol2xzst6p9fOg+prl6p7vO1sRYrIGg1WJGA5wQ==
+-----END X509 CRL-----