freetype,harfbuzz,icu git submodule, GLOB sourcefiles#9

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Iyashi wants to merge 8 commits intotangrams:masterfrom

Commits on Aug 29, 2020

Remove harfbuzz
Jannik Lohaus
committed
Add harfbuzz git submodule
Jannik Lohaus
committed
Remove freetype
Jannik Lohaus
committed
Add freetype git submodule
Jannik Lohaus
committed
Remove icu
Jannik Lohaus
committed
Add icu git submodule
Jannik Lohaus
committed
Add .gitignore /build
Jannik Lohaus
committed
Fix CMakeLists for git submodule usage, get source files via GLOB
Jannik Lohaus
committed