Make CE Shader file paths relative and/or prefer local over global

[BinToss]

    Directory: C:\ProgramData\Kornner Studios

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d----          2020-01-16  8:31 AM                Halo CE

    Directory: C:\ProgramData\Kornner Studios\Halo CE

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d----          2019-03-02  5:14 PM                shaders
-a---          2015-02-03  2:32 PM        1450428 OpenSauceUI.pak

    Directory: C:\ProgramData\Kornner Studios\Halo CE\shaders

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
-a---          2013-01-22  9:55 PM          40588 gbuffer_shaders.shd
-a---          2013-01-22  9:55 PM          37557 pp_shaders.shd