Add ugfx submodule

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "lib/chibios-contrib"]
 	path = lib/chibios-contrib
 	url = https://github.com/ChibiOS/ChibiOS-Contrib.git
+[submodule "lib/ugfx"]
+	path = lib/ugfx
+	url = https://bitbucket.org/Tectu/ugfx

lib/ugfx

@@ -0,0 +1 @@
+Subproject commit 13e084ae6231857cd0d472c529f34be07d93c08b