make mnCursorPos a sal_Int32

Change-Id: I37743b6c310acc70ceb9d08f502dcd7a96a436e4
longparas: xub_StrLen to sal_Int32

Change-Id: I93af34cd936510ee14ca1eead55a7abc3036554b
longparas: STRING_LEN->EDIT_NOLIMIT

Change-Id: I4ca1875bf4afa228c1617b4590a3a56f71de57c8
longparas: drop STRING_MAXLEN limit in TextDoc

Change-Id: Iabe74f423c2d65bad637e56e5ab44dd808d41df1
longparas: drop STRING_MAXLEN limit in TextEngine

Change-Id: Ib0f72e1fc0938ca286d0131b7bb1a00499ada7d4
disentangle CalcSize

Change-Id: I42248ff611dbe7c109076da5d548717898341be3
longparas: xub_StrLen to sal_Int32

Change-Id: Ib3eb5f9df112696b326bb30e4deed49d37f30c86