Add aspect-correction docs; enhance console & HUD

Add comprehensive aspect-correction documentation and README entries, and introduce a number of console layout, appearance, and motion features. The console received many enhancements: centered 4:3 uniform font scaling (con_scaleUniform), optional centered console extents (con_screenExtents), background style/color/opacity (con_backgroundStyle, con_backgroundColor, con_backgroundOpacity), smooth scroll and speed controls (con_scrollSmooth, con_scrollSmoothSpeed), scroll step control (con_scrollLines), fade (con_fade), and a legacy speed alias sync (scr_conspeed <-> con_speed). Implementation includes color parsing/util helpers, smooth scroll interpolation, uniform char metric computation, layout relayout/fixup, scaled drawing helpers, and updated console rendering to respect colors, alpha, and extents. Also: adjust console page scrolling to use a configurable step and flipped default sign for PgUp/PgDn handling in cl_keys, add HUD script loaded flag and change HUD rule behavior, tighten cl_hudAspect range and description, and wire up cvar descriptions. Updated template README to reference the new Aspect Correction guide.

Author: themuffinator

README.md

@@ -21,6 +21,13 @@ FnQuake3 is a modernized Quake III Arena engine project focused on retail compat
 - Performance work should stay practical and measurable.
 - Windows, Linux, macOS, and ARM targets are first-class concerns.
 
+## Features
+
+- Broad 4:3-aware aspect correction for HUDs, menus, UI model widgets, cinematics, and optional console font virtualization. See the embedded [Aspect Correction guide](docs/ASPECT_CORRECTION.md).
+- SDL3 backend support for video, audio, and input on modern platforms.
+- Compatibility-first engine modernization that keeps retail Quake III Arena assets, protocol behavior, and demos as first-class concerns.
+- Multiple renderer and platform targets aimed at practical performance across legacy and modern systems.
+
 ## Quick Start
 
 1. Build the engine for your platform or use a packaged build.
@@ -36,6 +43,7 @@ FnQuake3 is a modernized Quake III Arena engine project focused on retail compat
 ## Documentation
 
 - [Build Guide](BUILD.md) for compiling on supported platforms.
+- [Aspect Correction Guide](docs/ASPECT_CORRECTION.md) for HUD, menu, cinematic, and console scaling behavior.
 - [Technical Notes](docs/TECHNICAL.md) for maintainers, release flow, and repo conventions.
 - [Agent Guide](AGENTS.md) for automation rules and local repository references.