LCL: Constants moved from LMessages to a new .inc file.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46215 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL: use constants in controlconsts.inc. Issue #26673, patch from ocean.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46216 4005530d-fff6-0310-9dd1-cebe43e6787f