Updated dependencies structure:

- Added CMakeLists.txt for each dependency
- Added dependencies/CMakeLists.txt for specifying relation between main lib and it's dependencies

dependencies/squirrel/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.17)
+
+project(Squirrel)
+
+file(GLOB_RECURSE SRC
+	"include/*.h"
+)
+
+add_library(Squirrel INTERFACE)
+target_sources(Squirrel INTERFACE ${SRC})
+
+target_include_directories(Squirrel
+	INTERFACE
+		"./"
+		"include/"
+)