NEXXT 3.6.3 released

This minor update fixes some issues with the tile selection not following suit when resizing the CHR / Tile Editor,
as well as fixing the critical bug mentioned in the last blog post. 

Apart from that, there are just some minor improvements and additions. 
-50% zoom on the Navigator [F6] is now prettier/more detailed. 
-Scrolling on the map in the main editor now hogs less cpu time while live rendering the tiles; making it smoother as well. 
-On request of a user, there are now a whole bunch of custom grid sizes hidden behind the 8x grid button - right click it to access.