Function: `StructAppend`

Appends the contents of a second struct to the first struct either with or without overwrite

Method Signature

StructAppend(struct1=[structloose], struct2=[structloose], overwrite=[boolean])

Argument	Type	Required	Description	Default
`struct1`	`struct`	`true`	The target struct which will be the recipient of the appending
`struct2`	`struct`	`true`	The struct containing the values to be appended
`overwrite`	`boolean`	`false`	Default true. Whether to overwrite existing values found in struct1 from the values in struct2	`true`