(trunk, qt) #5483: use native windows icons, more win portability goodness from mikedld

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14195 f4695dd4-2c0a-0410-b89c-da849a56a58e
(trunk, qt) #4813: allow launching files in Qt interface

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14196 f4695dd4-2c0a-0410-b89c-da849a56a58e
(trunk, qt) #5312 'download checkbox toggle with spacebar is broken' -- fixed, patch by mikedld

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14197 f4695dd4-2c0a-0410-b89c-da849a56a58e
(trunk, qt) #3606 'Qt client New Torrent from Source Folder is Goofy' -- fixed, mikedld

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14198 f4695dd4-2c0a-0410-b89c-da849a56a58e