Edited chapter 3.

 - Fixed typos.
 - First/Second person -> Third person.
 - Added links to modules, functions, classes as footnotes.
 - "combox database" or  -> "combox data store"
 - "database" -> "data store"
 - Removed "Language choice" section; too personal to include in a
   formal report.
 - Removed "With the benefit of hindsight"; does not fit in this report,
   removed it for the sake of brevity.
 - Figure 3-1 -> Major changes - grayscaled, changed fonts, made it
   specific to combox file creation.

1 files changed, 636 insertions, 579 deletions

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