Having Catalyst initialized with immediate mode rendering on.

For simulation runs with Catalyst, where we may have hundreds
or more screenshots created, using display lists can cause
memory fragmentation issues on fixed memory HPC machines.
This can cause a process to crash even though there is memory
available because the display lists can take up a bunch of
contiguous memory. So I'm making the change that immediate
mode rendering is on by default to avoid this.

Change-Id: I528ec71399cb8ded39c7df34e835bd186dcd792b
Merge topic '13853_catalyst_immediate_mode_rendering2' into next

f8cfdea Having Catalyst initialized with immediate mode rendering on.