v3.0.0 development

[ko1nksm]

• [x] #11 - Remove scanning mode = and # (breaking changes).
• #20 - Add support for --with and --without flags. (merged in c1ddc07c77ae6e35147db07b39cbf2df0e3ec148)
• [x] [Generator] Ability to change internal variable names (OPTARG and OPTIND).
• [Generator] Ability to reduce workarounds for legacy shells.
• [x] Change the off attribute to the no attribute (breaking changes).
• [x] Add installation script for package management system (prepare for creating Homebrew Formulae).

[codecov[bot]]

Codecov Report

Merging #22 (092f56d) into master (c1ddc07) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #22   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          192       193    +1     
=========================================
+ Hits           192       193    +1     

Impacted Files	Coverage Δ
lib/getoptions_base.sh	100.00% <100.00%> (ø)

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