Autowidth cell calculation is now configurable

[eglitobias]

On the workbook you can now configure the font_scale_divisor and the bold_font_multiplier to get better results for the automatic cell width calculation
New PR based on feedback: #115

[eglitobias]

Example:

require 'axlsx'

p = Axlsx::Package.new
wb = p.workbook
wb.font_scale_divisor = 11.5
wb.bold_font_multiplier = 1.05
s = wb.styles
sm_bold = s.add_style b: true, sz: 5
m_bold = s.add_style b: true, sz: 11
b_bold = s.add_style b: true, sz: 16
ub_bold = s.add_style b: true, sz: 21
sm_text = s.add_style sz: 5
m_text = s.add_style sz: 11
b_text = s.add_style sz: 16
ub_text = s.add_style sz: 21

wb.add_worksheet(name: 'Line Chart') do |sheet|
  sheet.add_row(['Lorem', 'Lorem', 'Lorem', 'Lorem', 'Lorem', 'Lorem', 'Lorem', 'Lorem', 'WWW', 'www', 'iii', 'iii',
                 'Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed',
                 'Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed'],
                style: [sm_bold, m_bold, b_bold, ub_bold, sm_text, m_text, b_text, ub_text,
                        b_bold, b_text, b_bold, b_text, b_bold, b_text])
end

p.serialize 'example1.xlsx'

Result:

[kiskoza]

It looks a lot better, thanks for your extra time on making it configurable

[alexanderadam]

Would it make sense to document to add your example to examples/ or to the style reference?

[eglitobias]

Would it make sense to document to add your example to examples/ or to the style reference?

I think on the style reference page it doesn't make much sense because it's more about the styling of the font. But I can add the example from above to the examples.

[straydogstudio]

I agree. Nice work. @simi @noniq Any concerns on merging this?