Rename PShader to PShaderOpenGL and extract PShader interface. (#1556) #437

Job	Run time
Test Processing	4m 29s
(linux/x64) Create Processing Build	6m 20s
(macos/aarch64) Create Processing Build	5m 46s
(linux/aarch64) Create Processing Build	5m 9s
(windows/x64) Create Processing Build	5m 41s
(macos/x64) Create Processing Build	4m 55s
	32m 20s

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