GetCharPos returns EDIT_NOLIMIT on failure

Change-Id: Ie65526e66a71561aa64ed3517097d1274ffe7db4
remove _STRING_HXX gibberesh

Change-Id: I618aa9a2752014d392516a578e454bf6443fc6ba
longparas: STRING_LEN is intended here to expand to string len

so just expand it on entry instead

Change-Id: Ieb9c7501dccf9da91c7b8377ad75739cbe1c3609
longparas: convert ValidateKashidas to sal_Int32

we can use -1 as the failure return code as return value is always checked and
isolated from the rest of the code.

Change-Id: I87a743de82d681a7e4eabc61a576c4e50f1279a8