Remove WidgetCharset class and introduce templated WidgetList class (… #252

Job	Run time
provide-examples	5s
run-ci (examples/Basic/Basic.ino)	1m 32s
run-ci (examples/Callbacks/Callbacks.ino)	1m 29s
run-ci (examples/CharsetInput/CharsetInput.ino)	1m 49s
run-ci (examples/IntFloatValues/IntFloatValues.ino)	2m 4s
run-ci (examples/ItemBack/ItemBack.ino)	1m 24s
run-ci (examples/List/List.ino)	1m 36s
run-ci (examples/MenuTimeout/MenuTimeout.ino)	1m 25s
run-ci (examples/SubMenu/SubMenu.ino)	1m 37s
run-ci (examples/ViewShifting/ViewShifting.ino)	1m 59s
	15m 0s

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