- currently after trimming the value of the element, we set the valueLength, and then overwrite it after returning from the parse that does the trimming. This results in the wrong value for value length. This fixes it by checking if the valueLength has already been set, and only setting it in SpecifiedLengthParserBase.parse if it hasn't
- add tests

DAFFODIL-2658

- update check to captureValueLength in base parser if it's a complex element
- update shouldCaptureParseValueLength to use PrimType.String instead of representation Text, since strings valueLengths (and delimited valueLengths) are always handled by value parsers

DAFFODIL-2658

- add asserts to setAbsStartPos0bInBits and setAbsEndPos0bInBits to ensure they're not being overwritten
- undo change to capturedByValueParsers to put back im[liedRepresentation == Text
- do not capture the value lengths of choices in specified length parser base
- fix bug where padding is being added around prefixed length element (DAFFODIL-2943) by changing CaptureLengthRegion to wrap around contentlengthStart and padding
- fix bug where we use the valuelength to calculate the prefix length, according to the spec it should be the content length
- fix bug where we were missing return after PE for Out of Range Binary Integers (DAFFODIL-2942)
- fix bug where we were using the main element's qname instead of the prefixed element qname in the Unparse Error message
- refactor Prefixed parsers to use state's bitLimit to get the prefix length (PrefixedLengthParserMixin2) since the specifiedLengthPrefixedParser will take care of parsing the prefix length
- refactored Prefixed unparsers to not try to unparse prefix length since that is taken care of by SpecifiedLengthPrefixedUnparser
- refactored prefixed parsers and unparsers to remove unused prefixed length parser related members

DAFFODIL-2658

… Trim

- rename custom prefixedlength parsers to *BitLengthParsers to more accurately reflect what they're doing
- rename custom prefixedlength unparsers to MinimumLengthUnparsers to more accurately reflect what they're doing
- rename PrefixedLengthParserMixin2 to BitLengthFromBitLimitMixin to more accurately reflect what it is
- got rid of HexBinaryLengthPrefixed since it is the same as HexBinaryEndOfBitLimit

DAFFODIL-2658