Improve performance of RichLabel, add AppendText, adapt Typewriter to… #185

Job	Run time
Check the access tokens used for publishing	1s
Generate Version-Specific Network Keys	54s
Build for Linux	2m 9s
Build for MacOS	2m 34s
Build for Windows	4m 27s
Debug Build Artifacts	0s
Publish GitHub Release	0s
Publish to Forum	0s
	10m 5s

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