Add Fonter and Glypher interfaces

[sago35]

This PR adds the Fonter interface and the Glypher interface.

The bad thing about this PR is that it breaks compatibility. I tried to keep the changes to a minimum, as in the second commit , but it didn't keep compatibility.

With this change, we can do the following

• Fonts will be able to be placed in const areas such as #23 .
• Can support fonts with more than two colors, such as Unicode pictograms.
  • Can create an anti-aliased font.
    • This has a positive effect when generating fonts (especially CJK fonts) from TTF fonts
• Can put font data on spi-flash or sdcard.

[sago35]

An example of a Unicode pictogram is as follows I want to display it with a color, so I want to implement Draw() differently from the previous font.

[sago35]

I was able to add the interface without breaking compatibility. After this, force-push.

[deadprogram]

This looks great @sago35 thanks for working on it! Now merging.