UMG Templates plugin - blueprint UWidgets and more!

[Tefel]

@ZoltanE

Great! So, I tried to use the plugin but ran into the following problems:

• The example project doesn’t run: Error: An explicit Category specifier is required for any property exposed to the editor or Blueprints in an Engine module.
• After copying everything from the demo project’s content directory to a new 4.22 First Person template project the demo map can be loaded. However after visiting all stands the log is full of errors: InputMode:UIOnly - Attempting to focus Non-Focusable widget SObjectWidget [Widget.cpp(710)]!
• There are also warnings like these: Warning: Unable to find Slate Widget Style ‘bbb’. Using FInlineTextImageStyle defaults instead. Warning: Unable to find Slate Widget Style ‘water’. Using FInlineTextImageStyle defaults instead.
• The styling properties of the basic Text widget are hidden when the plugin is enabled making the text block useless.

4.23 recently was submitted where all UProperty categories errors were fixed.
I will check other warnings and fix them when I can.