remove unnecessary OctalCode include in main
use system flag for external library includes
Merge pull request #510 from birarda/conditional-ds

couple of patches
19366 - Smaller log display
Merge pull request #513 from Atlante45/19366

19366 - Smaller log display
implement keyhole frustum
fix spacing
Merge pull request #514 from ZappoMan/keyhole_frustum

Keyhole frustum
fixed CR spacing issue
Merge branch 'master' of https://github.com/worklist/hifi into keyhole_frustum
Merge pull request #515 from ZappoMan/keyhole_frustum

Keyhole frustum - CR feedback fix
Merge branch 'master' of https://github.com/worklist/hifi into voxel_animation