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

- add a CellRendererText to TimeTrackView with same font attribute
to have same rows height.
161 - Align rows of Params Panel and Timetrack Panel - test

- add a CellRendererPixbuf at end of TimeTrackView.
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
Fix:The (orange) timecursor gets invisible behind primary graduation

In Widget_Timeslider::redraw, draw the cursor after the graduation
161 - Align rows of Params Panel and Timetrack Panel - Debug

- Add some debug output into LayerTree::update_param_tree_header_height
to catch the gremlins
- Add a potential fix
161 - Align rows of Params Panel and Timetrack Panel - Debug2

- Add some debug output into Dock_Timetrack
161 - Align rows of Params Panel and Timetrack Panel - Progress9

- Fix stock icon ID : synfig-utils_timetrack_align (synfig- was missing)
161 - Align rows of Params Panel and Timetrack Panel - Progress10b

- Use of #define to adpat rendering hack
161 - Align rows of Params Panel and Timetrack Panel - Progress11b

- Align dock_timetrack and widget_timeslider time cursors by adding a drawing
area before timeslider and keyframe widgets
161 - Align rows of Params Panel and Timetrack Panel - Progress12b

- Fix windows ifdef target
161 - Align rows of Params Panel and Timetrack Panel - Progress13b

- better target differentiation
- (another) attempt to fix column align : set_sizing (Gtk::TREE_VIEW_COLUMN_AUTOSIZE) and comment
set_min_width(200) for both param_tree and timetrack_tree
161 - Align rows of Params Panel and Timetrack Panel - Progress14b

- another (could be the one!) attempt on sizing rows :
comment cellrenderer_time_track->set_fixed_size on TimeTrackView::mimic_resync()
161 - Align rows of Params Panel and Timetrack Panel - Progress15b

- Adapt the Dock_Curves border size "according" to different windows manager rendering
161 - Align rows of Params Panel and Timetrack Panel - Progress16b

- Remove debug comments
Fix161 - Align rows of Params Panel and Timetrack Panel

- Add some comments :
-- "Memory leaks ?"
-- "Commented during Align rows fixing"
-- Order of docks initialization
Fix161 - Align rows of Params Panel and Timetrack Panel - 2

- Replace unuseful comments by useful ones
Merge pull request #134 from d-j-a-y/djay_align_row2

Fix #161 - Align rows of Params Panel and Timetrack Panel