shader_runner: add ability to specify GL_TEXTURE_BASE_LEVEL

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
arb_texture_query_levels: add group and shader-runner dir

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
add compiler tests to verify existence and sensible signatures of textureQueryLevels()

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
arb_texture_query_levels: add fs execution test for textureQueryLevels

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
add vs execution test