Hotfix/v0.5.6 : "Conditional nil values getter" "LinkedList Items of Items", "String Masking feature" , "String LeftRight Trimmed" "RwxPartial String Improved", "Request types start, restart etc added" "Script type added"

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- "Conditional nil values getter"
- "LinkedList Items of Items",
- "String Masking feature" ,
- "String LeftRight Trimmed"
- "RwxPartial String Improved",
- "Request types start, restart etc added"
- "Script type added"

See merge request evatix-go/core!51