Generating a minimal font for devices with small space requirements

GlyphIGo was used to generate a subset of the Roboto font

cobalt/content/fonts contains a script called create_minimized_roboto.sh that can help recreate minimized font if needed

Steps:

1. cd src/cobalt/content/fonts
2. ./create_minimized_roboto.sh
3. Download fontforge using apt. sudo apt install fontforge
4. In fontforge, navigate the menu: Encoding->Reencode->Glyph Order. Scroll to the top, find the first glyph. By spec, this glyph is called .notdef, and is used when this font is the default font and there glyph for a character we're looking for is missing in the file. Often this will be blank after the last step, which can be undesired.
5. Copy .notdef glyph from a different font.
   1. Open a different font.
   2. Find the .notdef glyph.
   3. Select the glyph without opening it.
   4. Navigate the menu: Edit->Copy from the font you want to copy from.
   5. Switch focus to the minimized font.
   6. Select .notdef glyph.
   7. Navigate the menu: Edit->Paste.
6. Export the font using the menu: File->Generate Fonts..., make sure that the file name is correct.
7. Fix any errors if found, or if you can.