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.

red_scarf_engine/CMakeLists.txt

@@ -0,0 +1,7 @@
+add_executable(${PROJECT_NAME} src/main.cpp)
+
+target_include_directories(${PROJECT_NAME} PRIVATE
+    ${CMAKE_SOURCE_DIR})
+
+target_link_libraries(${PROJECT_NAME} PRIVATE
+    rse_graphics)