[FEATURE] Add FreeType2

[harrynull]

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This pull requests adds a new dependency - FreeType2
It also includes the LICENSE file of FreeType2 (docs/freetype.TXT) (GPL2)

[canihavesomecoffee]

Could you split the PR up in:

• Adding the library
• Making the modifications to the code

This will make the second one smaller, and easier to review.

[harrynull]

@canihavesomecoffee Done! I've opened a new PR at #877 .