feat: 添加激光子弹功能，更新相关资源和着色器

shaders/Laser.gdshader

@@ -0,0 +1,12 @@
+shader_type canvas_item;
+uniform vec4 color: source_color;
+uniform float laser_width: hint_range(0.01, 1.0) = 0;
+uniform float soft_edge: hint_range(0.0, 0.5) = 0.5;
+void fragment() {
+    float dist = abs(UV.x - 0.5);
+    float core = 1.0 - smoothstep(0.0, laser_width, dist);
+    float edge = 1.0 - smoothstep(laser_width, laser_width + soft_edge, dist);
+    float alpha = max(core, edge);
+    COLOR = color;
+    COLOR.a = alpha;
+}

shaders/test.gdshader

@@ -0,0 +1,5 @@
+shader_type canvas_item;
+
+void fragment() {
+	COLOR=vec4(vec2(textureSize(TEXTURE,0)),0,1);
+}