Updated point_downsample to use pcl1.7. This commit plus the directions in HACKING.md work around the "Illegal Instruction" crash.
Implemented pixel mapping file format and included and example file(config/pixel_map.ini). This checkin does not support overrides(ie: for zig-zag wiring).
Fixed risky string operation. Previously relied upon the call stack remaining intact after returning. Much more defensive now.
Implemented dmx rendering and finished implementation of encoding configuration section.
Added simple validaty checking