MaskEdit: avoid calling OnChange when setting initial values for Mask and Text.
Resolves issue #0019029.
(Code completion also made some unrelated changes synchronizing lower/uppercase usage in declarations)


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43350 4005530d-fff6-0310-9dd1-cebe43e6787f