0028826: Visualization, TKOpenGl - fix compatibility with strict OpenGL ES drivers

0028826: Visualization, TKOpenGl - fix compatibility with strict OpenGL ES drivers

OpenGl_ShaderProgram::Initialize() - precision declarations have been moved
after the list of enabled extensions.

Declarations.glsl - the fragment shader outputs have been re-declared as array
for proper assignment of default locations (draw buffers).

OpenGl_FrameBuffer - GL_HALF_FLOAT is now used instead of GL_HALF_FLOAT_OES on OpenGL ES 3.2+.
OpenGl_Texture - fixed initialization of Image_Format_RGB32 image format on OpenGL ES 3.0+.