Refactor Live2D plugin and renderer for improved clarity and performance

- Updated EGL and OpenGL ES integration in gl.rs for better context management.
- Simplified error handling and logging in model.rs and plugin.rs.
- Enhanced texture handling and rendering logic in renderer.rs.
- Added a script to find Cargo configuration files for easier debugging.
- Removed unused imports and dead code to clean up the codebase.

.find_cargo.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+echo "=== find cargo config ==="
+find /home/showen -name "config.toml" -path "*.cargo*" 2>/dev/null
+find /home/showen -name "config" -path "*.cargo*" 2>/dev/null
+find / -name "config.toml" -path "*cargo*" 2>/dev/null | head -5
+
+echo "=== check .cargo dir ==="
+ls -la /home/showen/.cargo/ 2>/dev/null
+
+echo "=== rustup cargo home ==="
+echo $CARGO_HOME
+ls -la ~/.cargo/ 2>/dev/null
+
+echo "=== project cargo ==="
+ls -la /home/showen/Showen/ShowenV2/.cargo/ 2>/dev/null
+find /home/showen/Showen -name ".cargo" -type d 2>/dev/null