[CHART] Deactivate tooltip when...

... changing the MC_CHS_NOTOOLTIPS style or when detroying the control.
[TREELIST] Fixes when reallocating subitems...

... when adding or removing a column.
[misc.h] Add mc_track_mouse().
[MDITAB] Simplify hot tracking by using mc_track_mouse().
[CHART] Simpify tooltip management by using mc_track_mouse().