Update 'Island' default heights

* TerrainChannel
    - updated default height setting for Island creation. (was tending
to create submerged islands)

* setupversioninfo.bat (bin) - revamped to use std git commit hashcode
Additional renaming and refactoring

* More renaming of missed subdirs & files
* Rename ADNE command to WDNE
Substitute a system 'missing' texture when a requested texture is not found

* Implemented a 'Missing Texture' texture tile for substitution when a
requested texture is not found.
* Re-implemented addon module DefaultInventoryToIARConverter to assist
in creation of an updated  DefaultInventory.iar that includes the
additional texture
Merge pull request #3 from greythane/master

Pulling latest changes from Greythane