+ Indirect illumination for gi.frag shader
+ Blue noise texture for future use
+ MousePos uniform for prepscene.frag
* Fixed distance field resolution distortion
* Amendment of comments
- Removed sandbox.h and scene.h
- Removed rc.frag

Bringing version beta into main branch.

+ Added coloured lights moving in a circular motion using an SD
* Attached buffers to `Demo` rather than generating them in `render()`, so these are now accessible from other functions
* As a result of above, added textures to UI for each buffer (you can now see the emission map, occlusion map, scene map, JFA map, and distance field map in debug mode)

+ Linear to sRGB conversion in gi.frag
* Fixed macOS lighting
* Code cleanup & optimisations

+ Linear interpolation of mouse position between frames for smoother drawing
+ Scene and Sandbox classes (to be expanded upon)
* Tweaked shader values for better lighting

* Fixes left-facing right-hand-side artifacting glitch on light sources

* Code cleanup
  - Removed unused UI code
  - Removed "viewer" mode
* Changed static images to use more optimal bit depths
+ Added distance field shader and buffer so that we don't need to send the entire output of JFA to the lighting shader.

* Fixed fuzzy walls - texture coordinates were being encoded with too little bit depth, meaning some pixels were holding the wrong texture coordinates.
* Added utility function to change bit depth of a framebuffer - big performance hit! Maybe reduce bit depth of other buffers to compensate?
* Reduced default ray count per pixel from 512 to 256.

+ Rudimentary 2D implementation
  + Raymarching
* Code cleanup
* Modified brush texture to clamp values
* Divided prep.frag into prepjfa.frag and prepscene.frag for convenience

Current lighting implementation produces "prickles" on light sources. This needs fixing.

+ Occlusion & emitter maps that can be drawn to separately
+ gi.frag for placeholder global illumination shader
- Removed all features pertaining to the old lighting model such as Lights and LightTypes, etc. These may come back later on.

These should've been in testing branch. Whoops!

Reverting:
cbf927e3 b0.1.0 JFA setup
434eeccf b0.2_0 JFA implementation
970b0fca b0.2_1 JFA fix; utility shader functions & hashmap
145d0786 b0.2_2 macOS fix

+ Added `shaders` hashmap for better management of shader programmes
+ Added reloading & loading utility functions to `Demo` class
+ Added some comments for readability
* Fixed JFA artifacting
* Temporarily removing non-debug UI during RC implementation

+ Implemented jump-flooding algorithm to create distance fields with
  (big milestone!!)
  + Implemented ping-pong buffering, prep.frag (to prepare UV mask for
    JFA), jfa.frag (to perform JFA), and rc.frag ('radiance cascades'
    final fragment shader, right now only displays framebuffer content
    from JFA)

* Fixed drawing brush
* Help text is now on by default

* Readability
  * Renamed functions
  + More comments
* Altered lighting.frag smooth shadows slightly
+ Added help dialogue to UI

* Fixed & changed random type selection
* Some code cleanup

+ Added saw light type
+ Added alternative mouse interactions with left control and left shift
+ Added light seeds for slightly different timings with noise, saw, and
  sine light types
+ Reintroduced perspective mode
+ Added Raylib to lib/ for compilation
* Renamed FLICKERING light type to NOISE
- Removed Raylib CMake fetch

+ Added static, sine, and flickering light types
* Cleaned up code
* Moved debug UI into main UI window
* Added adjustments for UI height depending on mode

+ Added another canvas texture
* Overhauled ImGui UI
  - Removed old tool icon
* Cleared up some code & added some comments
* README
  + Added git submodule instructions
  - Removed controls section

+ Dear ImGui w/ Raylib wrapper (rlImGui)
+ Integrated basic ImGui UI - colour picker, etc.
+ Added keybind to toggle UI
* Cleaned up some code

* Tool text fades to full opacity rather than black
* Removed .DS_Store & updated gitignore

This reverts commit b550edc5.

+ Tool text fades to full opacity rather than black
- Removed accidental .DS_Store

* Fixed lighting issues on 1080p+ Macbook display

* Better Windows setup instructions;
* Fixed lighting.frag - macOS & Windows unhappy with default arguments in GLSL functions
* General code cleanup

+ added gradient check before light calculation;
+ circles now indicate where lights are located when in lighting mode;
+ added controls section to README;
+ added tool icon in lower-left for better usability;
* renamed light.size to light.radius for clarity;
* organised lighting.frag into functions;
* changed to use 'out vec4 fragColor' rather than deprecated gl_FragColor;
- removed uApple & uSmoothShadows shader uniforms (no more manual toggling of soft/hard shadows);