Span implementation and TextBlockPainter refactoring
Pending fullscreen tests
Clearer names for variables
Add color refactorings from da0f0cd5ce
Merge from master
Extract a class to handle creating TextStyles
Use #public_send instead of #eval
Add specs for text fragments
Fix errors in extraction
Use TextStyleFactory for all text style creation

- Move all color handling to TextStyleFactory
Refactor text fragment helpers to work with Swt example
Rework how we track text styles for fragments

Instead of an Array[[Range, Text]], use a Hash{Range => [Text]}. Now,
on the DSL level, the fragment styles are organized by the substring
they apply to, so we have lots less processing to do in the backend.
Hooray for no more "nested_styles"! See spec/shoes/text_block_spec.rb
for an example of the expected format.
Rearrange code to help out poor 'span'
Extract style accumulation
Clean up

- Use convenience methods for creating fonts/styles
- Use better variable names, pass more parameters
- Remove extraneous respond_to? checks
- Attempt to write specs for TextBlockPainter, fail
Merge from master
Fix spec broken in merge
add back setIncrement for scroll bar
Change constant of vertical bar increment value
Use hash for applying styles; Span is working again