Version 1.4.0 - Image Cache System

Features:
- Instant wallpaper switching via RAM cache (--cache-size MB)
- New IPC commands: cache-list, cache-stats, unload, listactive
- LRU eviction when cache is full
- Cache hit detection for instant display

Update PKGBUILD description

Add test-video-modes.sh to .gitignore

Release v1.2.1 - Add stretch mode and improve scaling options

Release v1.2.0 - Panscan and Original Resolution Features

Add source files to repository for AUR packaging

- Removed src/ from .gitignore to include source code in releases
- Added all C source files (main.c, holder.c, cflogprinter.c, glad.c)
- Required for AUR package building from source
- Enables reproducible builds from GitHub releases