Adjust Menu Height

Changes the height of the menus.

This is a complete rewrite of Adjust menu and separator height and Adjust menu and separator height +PLUS+ by dougeeebear and Fra Diavolo respectively. The main visible differences are that it shouldn't break anything related to themes, extensions, or styles that affect menu appearance; for example this version will not distort the highlights in CuteMenus - Crystal SVG with OfficeXP menus enabled (the issue which gave me the thought to tackle this).

2006-11-08: Added even more comments than before, because this is one style where understanding it actually tends to be important.
2006-11-09: Rewrote the fix to keep iconic and non-iconic items an equal height so it doesn't depend on font size.
2006-11-26: Fixed small problem with my Iconic Menubar - Crystal SVG style as well as the feature in CuteMenus - Crystal SVG 1.8.2 based on it.
2006-11-30: Fixed: items with and without icons have unequal height in some cases with iconic class items having no icon. Fixed: shouldn't affect items on the bookmarks toolbar.