feat: use Direct2D to draw colorful emojis and to avoid customizing fallback fonts. (#24)

Squash following commits:

* feat: use Direct2D to draw colorful emojis and to avoid customizing fallback fonts.
commit f59076c
Author: zerxmega <zerxmega@foxmail.com>

* feat: use Direct2D to draw colorful emojis and to avoid customizing fallback fonts.
commit b0cda52
Author: zerxmega <zerxmega@foxmail.com>

* CandidatePreview's render is migrated from gdip to direct2d, and now Gdip_All.ahk is no longer needed
commit fe66c7b
Author: zerxmega <zerxmega@foxmail.com>

Author: rawbx

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "Lib/Gdip"]
 	path = Lib/Gdip
 	url = https://github.com/buliasz/AHKv2-Gdip
+[submodule "Lib/Direct2D"]
+	path = Lib/Direct2D
+	url = https://github.com/rawbx/AHK-Direct2D