Port water-only units from mathusummut's Glest

[Pizza90]

Water-only units have been a feature request for many years. According to https://github.com/glest/glest-source/issues/84 they have been implemented by mathussummut for his 'Glest'. I suggest to port this feature to MG.

[andy_5995]

I add my vote for this feature.

[titi]

AI does not play these units the right way and playing vs AI is a very important part of MG. SO no, it will not be added.