Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/qoi/CMakeLists.txt

@@ -0,0 +1,9 @@
+# PrusaSlicer specific CMake
+
+cmake_minimum_required(VERSION 3.13)
+project(qoi)
+
+add_library(qoi STATIC
+    qoi.h
+    qoilib.c
+)