Enhance parameter selection

[ofey404]

Issue #, if available:

Description of changes:

Add a keyboard shortcut ^U to clear selected parameter in parameter expanding view. Useful when you set a default value, but don't like it. You can quickly kill it and replace with things you like.

Also simplified title of each parameter view.

For example, a parameter like <Name=DefaultValue>

• Old title: Name=DefaultValue
• New title: Name

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