Split vulkan_base into smaller units

Closes #30. This is a basic refactoring of the graphics module, so
everything won't be in single file.

utilities/CMakeLists.txt

@@ -0,0 +1,10 @@
+add_library(rse_utilities SHARED)
+
+target_include_directories(rse_utilities PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    )
+
+target_sources(rse_utilities PRIVATE
+    src/logger.cpp
+    src/file_utils.cpp
+    )