build with new Pillow working; correct icon name

[gadams999]

Issue #, if available: Addresses CVE-2019-16865 for Pillow module

Description of changes:

• Updated requirements.txt to version of Pillow not affected by CVE
• Typo in readme file for building icons
• Re-ran icon and PUML build - corrected name of EMREEngineMapRM3 to EMREngineMapRM3 (additional E)

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