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/library/.gitignore

@@ -0,0 +1,11 @@
+libmbed*
+*.sln
+*.vcxproj
+
+###START_GENERATED_FILES###
+/error.c
+/version_features.c
+/ssl_debug_helpers_generated.c
+/psa_crypto_driver_wrappers.h
+/psa_crypto_driver_wrappers_no_static.c
+###END_GENERATED_FILES###