added core 3d camera free (#108)

* added core_split_screen example

* added core_vr_simulator example

* Delete launch.json

* added core 3d camera free

* added core_smooth pixel-perfect camera

---------

Co-authored-by: “Timfon” <“timothy_fong@brown.edu”>
Co-authored-by: Richard Smith <electronstudio@users.noreply.github.com>

examples/core/core_3d_camera_free.py

@@ -0,0 +1,60 @@
+from raylib import Fade
+import pyray
+from pyray import *
+
+# Initialization
+screenWidth = 800
+screenHeight = 450
+
+init_window(screenWidth, screenHeight, "raylib [core] example - 3d camera free")
+
+# Define the camera to look into our 3d world
+camera = Camera3D()
+camera.position = Vector3(10.0, 10.0, 10.0)  # Camera position
+camera.target = Vector3(0.0, 0.0, 0.0)       # Camera looking at point
+camera.up = Vector3(0.0, 1.0, 0.0)           # Camera up vector (rotation towards target)
+camera.fovy = 45.0                           # Camera field-of-view Y
+camera.projection = pyray.CAMERA_PERSPECTIVE       # Camera projection type
+
+cubePosition = Vector3(0.0, 0.0, 0.0)
+
+disable_cursor()                  # Limit cursor to relative movement inside the window
+
+set_target_fps(60)                 # Set our game to run at 60 frames-per-second
+
+# Main game loop
+while not window_should_close():   # Detect window close button or ESC key
+    # Update
+    update_camera(camera, pyray.CAMERA_FREE)
+
+    if is_key_down(pyray.KEY_Z):
+        camera.target = Vector3(0.0, 0.0, 0.0)
+
+    # Draw
+    begin_drawing()
+
+    clear_background(RAYWHITE)
+
+    begin_mode_3d(camera)
+
+    draw_cube(cubePosition, 2.0, 2.0, 2.0, RED)
+    draw_cube_wires(cubePosition, 2.0, 2.0, 2.0, MAROON)
+
+    draw_grid(10, 1.0)
+
+    end_mode_3d()
+
+    draw_rectangle(10, 10, 320, 133, Fade(SKYBLUE, 0.5))
+    draw_rectangle_lines(10, 10, 320, 133, BLUE)
+
+    draw_text("Free camera default controls:", 20, 20, 10, BLACK)
+    draw_text("- Mouse Wheel to Zoom in-out", 40, 40, 10, DARKGRAY)
+    draw_text("- Mouse Wheel Pressed to Pan", 40, 60, 10, DARKGRAY)
+    draw_text("- Alt + Mouse Wheel Pressed to Rotate", 40, 80, 10, DARKGRAY)
+    draw_text("- Alt + Ctrl + Mouse Wheel Pressed for Smooth Zoom", 40, 100, 10, DARKGRAY)
+    draw_text("- Z to zoom to (0, 0, 0)", 40, 120, 10, DARKGRAY)
+
+    end_drawing()
+
+# De-Initialization
+close_window()  # Close window and OpenGL context