Rename various things for more inclusive language

Rename various things for more inclusive language

This change renames various things to avoid gender-specific or degatory
terms.

Khronos inclusive language policy:
https://www.khronos.org/about/inclusive-language

Majority of the changes are due to the term 'dummy', as in mannequin or
placeholder, which in programming may mean any of empty, placeholder,
unused, minimal, busywork, ignored or irrelevant.

Changes not included are file names (gluDummyRenderContext), test names
(dummy_instruction_set) or branch names (master).

Affects:
*

Components: Framework, Vulkan, OpenGL
VK-GL-CTS issue: 2509

Change-Id: I3837477a1b3de1142e8d97c503890ccbce9138f8