Revert "#718 Replacing smilies by better quality PNGs"

This reverts commit 1fabd5298fea55c6450900d64d40496b5132a553.
Revert "Revert "#718 Replacing smilies by better quality PNGs""

This reverts commit eb59a2ed99631a54ba72a85c84fc9c6db6d6b909.