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

tactility-core/README.md

@@ -0,0 +1,8 @@
+## Description
+
+Some of this code is derived from [Flipper Zero firmware](https://github.com/flipperdevices/flipperzero-firmware/).
+Some of it is inspired by the Android operating system.
+
+## License
+
+[GNU General Public License Version 3](LICENSE.md)