wxGUI/history: Add time/status icons in front of browser nodes

[lindakarlovska]

This PR is built on #3622 (has to be rebased after #3622 will be merged). It adds icons in front of each node in the history browser panel.

Command nodes are distinguished according to command status: failed : aborted: running: success: unknown:

All time period nodes have the same icon:

The history browser looks as follows (with #3622 applied):

[petrasovaa]

This looks great! Could we have a separate check image (e.g., success.png) only for this? Otherwise this image is used elsewhere in gui and it wouldn't visually fit with the rest of the icons.