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

app-esp/src/main.c

@@ -0,0 +1,22 @@
+#include "tactility.h"
+#include "board_config.h"
+
+// Apps
+#include "hello_world/hello_world.h"
+
+__attribute__((unused)) void app_main(void) {
+    static const Config config = {
+        /**
+         * Auto-select a board based on the ./sdkconfig.board.* file
+         * that you copied to ./sdkconfig before you opened this project.
+         */
+        .hardware = TT_BOARD_HARDWARE,
+        .apps = {
+            &hello_world_app
+        },
+        .services = { },
+        .auto_start_app_id = NULL
+    };
+
+    tactility_start(&config);
+}