Get selected area of tiles from tileset #33
Description
When the user clicks and drags the mouse, the program has to acknowledge that the user wants more than one tile if the user's dragging past the area of one tile size.
I've already done a test of how the functionality would work (namely tests of how clicking and dragging to create a rectangle in a separate demo), but it may take a bit of tweaking of the TilePanel class, along with minor adjustments in other classes, in order to actually have this feature work.
The editor has to also recognize that multiple tiles are taken instead of just one. The editor will only recognize the ID of the first tile clicked, or included, in the area.
I'll include this feature probably in the v0.2.5_04 release.