- Moved OpenGL library wrapper into platform

- Finished reorganizing PLANNING.md

planning/3D_PHYSICS.md

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+
+# 3D Physics (`physics3d`)
+
+## Table of Contents
+
+<!-- TOC -->
+* [Home](./CONTENTS.md#planning-documentation-for-fennec)
+* [3D Physics (`physics3d`)](#3d-physics-physics3d)
+  * [Table of Contents](#table-of-contents)
+  * [Introduction](#introduction)
+  * [System Layout](#system-layout)
+<!-- TOC -->
+
+
+## Introduction
+
+&ensp; This system will handle newtonian physics for 3D rigid and soft-bodies. This should include  
+articulated skeletal systems, particle physics, and soft-body physics. The following soft-body systems  
+will be supported with the associated implementation; elastics with finite element simulation, cloth  
+physics with position-based dynamics, oceans with iWave, 3D fluid dynamics with smoothed-particle  
+hydrodynamics, 2D surface fluid dynamics with force-based dynamics.
+
+
+## System Layout
+
+* Rigid Body Physics
+    * Newtonian Physics and Collision Resolution
+    * Articulated Skeletal Systems
+        * Inverse Kinematics
+        * Stiff Rods
+- Particle Physics
+* Soft Body Physics
+    * Elastics &rarr; Finite Element Simulation
+    * Cloth &rarr; Position-Based Dynamics
+    * Water
+        * Oceans &rarr; iWave
+            * Reasoning: iWave provides interactive lightweight fluid dynamics suitable for flat planes of water.
+              <br><br>
+
+        * 3D Fluid Dynamics &rarr; Smoothed-Particle Hydrodynamics
+            * Reasoning: This is the simplest method for simulating 3D bodies of water. This should exclusively be
+              used for small scale simulations where self-interactive fluids are necessary. I.E. pouring water into
+              a glass.
+              <br><br>
+
+        * 2D Surface Fluid Dynamics &rarr; Force-Based Dynamics
+            * Reasoning: This model, like iWave, provides lightweight interactive fluid dynamics, but is more easily
+              adapted to flowing surfaces such as streams and rivers.