Feature/dicom attributes

[KarlSjostrand]

• Refactored attributes -> elements
• Refactored some class names, skipping the "Dicom" prefix for brevity
• Created Element class for describing a single DICOM data element, with parsing to various formats of its value
• Created Elements class for aggregating and working with sets of Element instances
• Created ElementFolds class for streaming aggregation into Elements
• Created the managed source 'Keyword' file for tag-to-tagname lookups
• Added more tags to Tag, Dictionary and Keyword files from DICOM part 6 and 7
• Updated TagPath less-than operator along with ModifyFlow to work more stringently
• Added tests and documentation

[coveralls]

Pull Request Test Coverage Report for Build 84

• 937 of 1017 (92.13%) changed or added relevant lines in 18 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+1.8%) to 91.747%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/scala/se/nimsa/dicom/data/CharacterSets.scala	5	6	83.33%
src/main/scala/se/nimsa/dicom/streams/ModifyFlow.scala	21	22	95.45%
src/main/scala/se/nimsa/dicom/data/package.scala	83	84	98.81%
src/main/scala/se/nimsa/dicom/streams/ParseFlow.scala	23	25	92.0%
src/main/scala/se/nimsa/dicom/streams/DicomFlows.scala	56	59	94.92%
src/main/scala/se/nimsa/dicom/streams/ElementFlows.scala	43	48	89.58%
src/main/scala/se/nimsa/dicom/data/DicomParts.scala	19	24	79.17%
src/main/scala/se/nimsa/dicom/streams/CollectFlow.scala	43	48	89.58%
src/main/scala/se/nimsa/dicom/streams/DicomFlow.scala	54	64	84.38%
src/main/scala/se/nimsa/dicom/data/DicomParsing.scala	107	117	91.45%

Files with Coverage Reduction	New Missed Lines	%
src/main/scala/se/nimsa/dicom/streams/DicomFlow.scala	1	87.21%
src/main/scala/se/nimsa/dicom/streams/DicomFlows.scala	2	90.61%

Totals
Change from base Build 17:	1.8%
Covered Lines:	1434
Relevant Lines:	1563

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💛 - Coveralls

[fredrik-exini]

Nice work!