FiltersDialog now uses a color picker for color selection

[safield]

trafficstars

-FiltersDialog no longer uses a drop down box of predefined SVG color strings. In place it uses two push buttons that launch a QColorDialog. This allows for custom color specification.

-refactored Filter class to use QColor for its fore and back colors, instead of the old approach which uses strings. This reduces coupling with UI.

-incrememnted FilterSet::FILTERSET_VERSION to 2, since Filters now store custom colors. These colors are saved in config as hex strings. BACKWARDS COMPATIBILITY IS MAINTAINED WITH VERSION 1 CONFIG FILES. (made the assumption that backwards compatibility should always be maintained.)

[safield]

I believe the travis-ci clang build is broken, unrelated to this commit.

[variar]

Qt in brew has been updated to 5.10. Seems like this version does not support macos 10.7. Changing to 10.8 in glogg.pro should fix ci build.

[safield]

Should that be fixed in the mainline, then I pull in the commit to my fork, then resubmit pull request?

Are pull requests ever accepted with failed continuous integration builds?

[variar]

I've created PR https://github.com/nickbnf/glogg/pull/202 to address ci issue

[safield]

Has this pull request not been accepted because the design direction is not desirable, or because the code implementation is not of a high enough quality?

Or is it just a matter of free time to review it?

I would be willing to address the issues, if there were some.