added strenght unifrom to flow fragment shader
added strenght unifrom to flow fragment shader

added option to disable grayscale shader

headupinclouds/ogles_gpgpu,hunter-packages/ogles_gpgpu,hunter-packages/ogles_gpgpu,headupinclouds/ogles_gpgpu,headupinclouds/ogles_gpgpu,headupinclouds/ogles_gpgpu,hunter-packages/ogles_gpgpu,hunter-packages/ogles_gpgpu