Sean's Optimum Branch Merge

[bdbcat]

Ahoy testers...

We have started the process of merging Sean's excellent optimization work into the OCPN github master branch. This will be an incremental process, pulling in small and not-so-small diffs individually so that we may manage regression problems cleanly. We plan to get most of Sean's work integrated and stabilized before the next Beta.

The first diff, in place now, applies OpenGL texture-based text rendering to vector charts.

Those who have source build capabilities are encouraged to clone/pull the latest github master branch, build it, and beat it with a stick.

I'll try to keep this thread updated with our progress reports. Please report build/run problems here, as well.

Thanks
Dave