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/freertos-kernel/CMakeLists.txt

@@ -0,0 +1,37 @@
+cmake_minimum_required(VERSION 3.5)
+project(freertos-kernel C)
+
+set(FREERTOS_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
+set(KERNEL_DIR ${FREERTOS_DIR}/portable/ThirdParty/GCC/Posix)
+
+include_directories(
+    .
+    ${FREERTOS_DIR}/include
+    ${KERNEL_DIR}
+    ${KERNEL_DIR}/utils
+)
+
+# FreeRTOS sources
+FILE(GLOB FREERTOS_SOURCES ${FREERTOS_DIR}/*.c)
+
+# Memory manager (use malloc() / free())
+list(APPEND FREERTOS_SOURCES "${FREERTOS_DIR}/portable/MemMang/heap_3.c")
+
+# Port sources
+FILE(GLOB KERNEL_SOURCES ${KERNEL_DIR}/*.c)
+list(APPEND FREERTOS_SOURCES ${KERNEL_SOURCES})
+FILE(GLOB KERNEL_SOURCES ${KERNEL_DIR}/utils/*.c)
+list(APPEND FREERTOS_SOURCES ${KERNEL_SOURCES})
+
+# Link FreeRTOS as a static library
+add_library(freertos-kernel STATIC ${FREERTOS_SOURCES})
+
+target_sources(freertos-kernel 
+    PRIVATE ${FREERTOS_SOURCES}
+    PUBLIC ${FREERTOS_HEADERS}
+)
+target_include_directories(freertos-kernel
+    PRIVATE ${FREERTOS_DIR}/include
+    INTERFACE ${FREERTOS_DIR}/include
+    INTERFACE ${KERNEL_DIR}
+)