#17 Option to use tabs instead of spaces

[Anonymous]

Add an option to use tabs instead of spaces in the
generated code. The SciTE editor has these options:

1. Tab Size (Width of a tab character)
2. Indent Size (Number of spaces to indent)
3. Use Tabs (enable/disable use of tabs)

If tabs are enabled, then a single tab is used for
indentation. If tabs are disabled, then indent by 'Indent
Size' spaces. Tab characters are displayed the same
width as 'Tab Size' spaces.