Deprecate GEANY_WINDOW_MINIMAL_WIDTH/GEANY_WINDOW_MINIMAL_HEIGHT to not set Geany's minimum window size anymore (closes #2972992).
As replacement, add GEANY_DEFAULT_DIALOG_HEIGHT.

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@4782 ea778897-0a13-0410-b9d1-a72fbfd435f5