Changes

tmf: Fix font height in TimeGraphRender.setFontForHeight()

Implement a workaround so that the font height matches the requested
pixel height, as the font height in points determined by calculation
results in a larger font than expected.

https://github.com/eclipse-platform/eclipse.platform.swt/issues/1193

Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>

tmf: Remove workaround for font height in TimeGraphControl.drawMarker()

With the font now matching the requested height, the workaround for the
marker symbol text y-position can be removed.

Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>

tmf: Adjust font height for time graph name and labels

With the font now matching the requested height, request a slightly
larger (2px) font height for time graph name and labels, to improve
readability. In both cases the text is centered using the actual
rendered text height.

Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>