merged gl-reinit, try to fix crash on reiniting

assets/shaders/particle-shader.fragment

@@ -1,7 +1,7 @@
 precision mediump float;
 
-in vec2 texCoord;
-flat in vec4 color;
+varying vec2 texCoord;
+varying vec4 color;
 
 uniform sampler2D Texture;
 

assets/shaders/particle-shader.vertex

@@ -2,8 +2,8 @@ attribute vec3 vPosition;
 attribute vec2 vTexCoord;
 attribute vec4 vColor;
 
-out vec2 texCoord;
-flat out vec4 color;
+varying vec2 texCoord;
+varying vec4 color;
 
 uniform mat4 ProjectionMatrix;