Allow disabling of display list usage, v1.

Some MesaGL implementations (since 2016) have trouble (segv) when one tries
to store vertex array operations into display lists. The practice is indeed
somewhat questionable :) The following options will allow complete or partial
disablement of display list usage.
OpenGL.UseDisplayLists:                     1
OpenGL.UseDisplayListsForVertexArrays:      1

OpenGL.UseDisplayLists already works.

Handling of OpenGL.UseDisplayListsForVertexArrays still needs to be
implemented as it requires review of all GL rendering classes.