161 - Align rows of Params Panel and Timetrack Panel - Progress7

WARNING THIS IS A TEMPORARY COMMIT
who have a reference to a hard linked ressource (1x16 alpha icon)

- Add initial support of alpha icon inside timetrack dock's treeview
- Add a gtk::drawingarea widget inside the timetrack dock's to align the time cursors
161 - Align rows of Params Panel and Timetrack Panel - Progress8

WARNING : HARD LINKED RESSOURCE

- Add utils_timetrack_align_icon.sif file
- Update icon procedure to include utils_timetrack_align_icon.sif
- Create icon stock icon for utils_timetrack_align_icon.sif
Fix161 - Align rows of Params Panel and Timetrack Panel - End

- Use the registred icon "utils_timetrack_align" in place of hard linked