Split up methods and update code parts

[mmachatschek]

Purpose

Updated some code parts.

Approach

Added one test for missing code unit.

Open Questions and Pre-Merge TODOs

• [x] composer lint and composer fix was executed.
• [x] Tests were written and pass with 100% coverage.
• [x] A issue with a detailed explanation of the problem/enhancement was created and linked.

[mmachatschek]

@howard what do you think about the changes?

[codecov-io]

Codecov Report

Merging #115 into develop will not change coverage. The diff coverage is 100%.

@@           Coverage Diff            @@
##             develop   #115   +/-   ##
========================================
  Coverage        100%   100%           
- Complexity       267    269    +2     
========================================
  Files             49     49           
  Lines            701    701           
========================================
  Hits             701    701

Impacted Files	Coverage Δ	Complexity Δ
src/FINDOLOGIC/Export/Data/Property.php	100% <ø> (ø)	11 <0> (ø)	:arrow_down:
...OLOGIC/Export/Helpers/UsergroupAwareMultiValue.php	100% <ø> (ø)	10 <0> (ø)	:arrow_down:
src/FINDOLOGIC/Export/Data/AllKeywords.php	100% <100%> (ø)	4 <0> (ø)	:arrow_down:
src/FINDOLOGIC/Export/XML/XMLItem.php	100% <100%> (ø)	26 <0> (-1)	:arrow_down:
src/FINDOLOGIC/Export/Data/Item.php	100% <100%> (ø)	59 <0> (ø)	:arrow_down:
src/FINDOLOGIC/Export/Helpers/DataHelper.php	100% <100%> (ø)	17 <4> (+1)	:arrow_up:
src/FINDOLOGIC/Export/CSV/CSVExporter.php	100% <100%> (ø)	9 <3> (+2)	:arrow_up:
src/FINDOLOGIC/Export/CSV/CSVItem.php	100% <100%> (ø)	12 <0> (ø)	:arrow_down:
src/FINDOLOGIC/Export/Exporter.php	100% <100%> (ø)	5 <1> (ø)	:arrow_down:
src/FINDOLOGIC/Export/Data/AllOrdernumbers.php	100% <100%> (ø)	4 <0> (ø)	:arrow_down:

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