mesa: Rewrite the way uniforms are tracked and handled

Switch all of the code in ir_to_mesa, st_glsl_to_tgsi, glUniform*,
glGetUniform, glGetUniformLocation, and glGetActiveUniforms to use the
gl_uniform_storage structures in the gl_shader_program.

A couple of notes:

 * Like most rewrite-the-world patches, this should be reviewed by
   applying the patch and examining the modified functions.

 * This leaves a lot of dead code around in linker.cpp and
   uniform_query.cpp.  This will be deleted in the next patches.

v2: Update the comment block (previously a FINISHME) in _mesa_uniform
about generating GL_INVALID_VALUE when an out-of-range sampler index
is specified.

Signed-off-by: Ian Romanick <[email protected]>
Tested-by: Tom Stellard <[email protected]>

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