Missing time import when using xsd:time with optional fields

[kruegge]

Description When generating Go code from XSD schemas that use xsd:time (mapped to time.Time), the time package import is missing from the generated code if the field is optional (pointer type).

Root Cause The code generator checks for time.Time using exact string equality (fieldType == "time.Time"), but when a field is optional, the type becomes *time.Time (pointer), causing the check to fail and the import to be omitted.

Affected Code The issue occurs in genGo.go in multiple locations where time.Time detection happens.

Example XSD:

<xsd:element name="StartTime" type="xsd:time" minOccurs="0" maxOccurs="1"/>

Generated Go (broken):

// Missing: import "time"

type SomeType struct {
    StartTime *time.Time `xml:"StartTime"`  // ❌ Compilation error: undefined: time
}

Expected:

import "time"

type SomeType struct {
    StartTime *time.Time `xml:"StartTime"`  // ✅ Works correctly
}

Solution Change the exact equality check to a substring check to handle both time.Time and *time.Time:

Before:

if fieldType == "time.Time" {
    gen.ImportTime = true
}

After:

if strings.Contains(fieldType, "time.Time") {
    gen.ImportTime = true
}