Remove hsuSelKeyType from ChewingConfigData

Signed-off-by: ChangZhuo Chen (陳昌倬) <czchen@gmail.com>
Let parameter of KBStr2Num be const

Signed-off-by: ChangZhuo Chen (陳昌倬) <czchen@gmail.com>
Let parameter of chewing_get* APIs be const

Signed-off-by: ChangZhuo Chen (陳昌倬) <czchen@gmail.com>
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