Add "Trebuchet MS" fonts. CORE-16272
- Add "Trebuchet MS", "Trebuchet MS Bold", "Trebuchet MS Bold Italic" and "Trebuchet MS Italic" fonts by duplicating "Open Sans" fonts and renaming them.
- Delete some "Trebuchet MS" font substitutes.
- Add LICENSE file.
I made these font files by using FontForge. Their family name is "Trebuchet MS". Their display names are "Trebuchet MS", "Trebuchet MS Bold", "Trebuchet MS Bold Italic" and "Trebuchet MS Italic". Their font filenames are trebuc.ttf, trebucbd.ttf, trebucbi.ttf and trebucit.ttf. The Underline Positions are hacked by adding an integer value for workaround of FontForge's bug.
