Genericify this shit.

Signed-off-by: Mloc-Argent <colmohici@gmail.com>
Expansion of every "icon = ''" path.

Supposed to help compilation times.  Who knows.

Signed-off-by: Mloc-Argent <colmohici@gmail.com>
Merge pull request #3631 from Mloc/pathexpand

Absolutized all icon paths.
Update disease.dm

This will remove some run-time errors, allowing disease to work when the mob has no reagents (new players and simple animals).
Merge pull request #3633 from ZipIce/patch-2

Update disease.dm
Merged with bay12.