Add shortcut keys to toolbar and menu item tooltips/help text
Add 'Show Item' and 'Show Full Map' to map editor menu

'Show Item' brings up a dialog to select a type and enter an item index to scroll/zoom to
Set TEXTURES to modified on 'Modify Offsets'

Also update the offsets display if the current texture is selected
Add cvar font_monospace

Sets the font to use for the console and monospace lists, comma separated
Thing browser 'details view' items now have fixed width

Using TextBox to wrap long names instead, to avoid situations where only 1 column would show
Fix crash on 'Run Map' with a newly created, unsaved map

Fixes #144
Merge branch 'master' of https://github.com/sirjuddington/SLADE into osx