Feature Request: Support case conversion like {{name.uppercase}} or {{name | lowercase}}

[rijieli]

Adding additional modifiers when using names or other text-related patterns. I think it could be 2 styles.

Style 1 using .:

• {{name.uppercase}}
• {{name.lowercase}}
• {{name.capitalize}}

Style 2 using |:

• {{name | uppercase}}
• {{name | lowercase}}
• {{name | capitalize}}