Make font sizes configurable/changeable

[dstillman]

Interim manual solution in overlay.css:

#zotero-collections-tree treechildren, #zotero-items-tree treechildren,
#zotero-pane label, #zotero-pane textbox
{
     font-size: 1.5em;
}

[dstillman]

(In [1139]) Closes #382, Make font sizes configurable/changeable

Configurable in preferences or via hidden pref for more extreme options

Also straightened up diplay of UI options in pref pane

[dstillman]

(In [1140]) Addresses #382, Make font sizes configurable/changeable

Localize strings

[dstillman]

Need font size support in external windows (especially pop-up note window)

[dstillman]

(In [1169]) Closes #382, Make font sizes configurable/changeable

Add font size support in external windows

Windows can use the font size pref by including a line like the following in their init script:

Zotero.setFontSize(rootElement);

rootElement should be a XUL element that surrounds all content (but not a <window> or <dialog> or anything that doesn't have a 'style' property)

Windows with treeviews also need to include zotero.css:

<?xml-stylesheet href="chrome://zotero/skin/zotero.css" type="text/css"?>

Utilities should also do this for any GUIs they create.