Add support for DMN 1.5

[opatrascoiu]

Expected Behavior

Issues:

DMN15-78 Underspecified when ranges may include a qualified name for the endpoint, which resolves to null
DMN15-86 Table 62 limited to "negative numbers"
DMN15-99 No built-in function to support Range conversion
DMN15-107 No support for numbers in scientific notation
DMN15-108 Positive unary tests lack equality operators
DMN15-121 It is not possible to use a range of Dates as an iteration context
DMN15-139 Import into default namespace is undefined
DMN15-135 Precision on Allowed Values UnaryTests
DMN15-143 Missing FEEL function to replace items in a list

Ballot 1
DMN15-79 Typo in the DMN 1.4 XSD schema (complexType tFilter)
DMN15-81 Typo in 8.3.1 Decision Table metamodel "DecsionTable"
DMN15-83 Typo in 6.3.7 Decision metamodel

Ballot 2
DMN15-18 Enumerations can only be defined as strings
DMN15-78 Underspecified when ranges may include a qualified name for the endpoint, which resolves to null
DMN15-86 Table 62 limited to "negative numbers"
DMN15-88 UNused Requirements are considered invalid
DMN15-94 Typo in "10.3.1.2 Grammar rules" 3rd bulletpoint in the bottom
DMN15-96 Gaps: Range as input, mapping to JSON, evaluation of non-FEEL expression languages
DMN15-99 No built-in function to support Range conversion
DMN15-106 Incorrect reference to FEEL rule
DMN15-107 No support for numbers in scientific notation
DMN15-108 Positive unary tests lack equality operators
DMN15-109 There are questions regarding precedence of operator between negation and exponation

Ballot 3
DMN15-6 Depiction of Input Data is not harmonized with BPMN and CMMN
DMN15-65 spec places unrealistic constraints on decision expressions and BKM parameter bindings
DMN15-119 Incorrect function name in example
DMN15-120 Wording in section above does not match the rule 35 in grammar
DMN15-121 It is not possible to use a range of Dates as an iteration context
DMN15-125 Lists and filters section does not provide a dot accessor "." example with null
DMN15-130 False, or at least ignored statement by most if not all vendors
DMN15-131 Another False, or at least ignored statement by most vendors
DMN15-137 Allowed Values for collection item definitions
DMN15-139 Import into default namespace is undefined

Ballot 4
DMN15-27 Improvement of Semantic Domains Specification
DMN15-42 data equivalence with date and time
DMN15-44 Clarification regarding equivalence of date vs date and time
DMN15-135 Precision on Allowed Values UnaryTests
DMN15-143 Missing FEEL function to replace items in a list

Ballot 5
DMN15-56 Typos in meta model
DMN15-74 Incorrect typeRef for variables associated to BKMs
DMN15-104 Acknowledgements for DMN 1.4 and 1.5 contributors needed
DMN15-118 Typo in Table 66
DMN15-153 Multiple empty imports using the order as a precedence is not allowed
DMN15-155 Superfluous spaces after "1"
DMN15-157 Copyright section needs update
DMN15-159 New Namespace URIs needed

Actual Behavior

jDMN Version where this issue was observed

Steps to reproduce the behavior