Tests: Visual test suite for PNG loading. Issue #24119, patch from José Mejuto

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40906 4005530d-fff6-0310-9dd1-cebe43e6787f
Tests: move lclmanual -> manual/lcl

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40907 4005530d-fff6-0310-9dd1-cebe43e6787f