AST-1637 Only read the 'fields to read' in MSBDAReader

While working on another MR I found that MSBDAReader always creates a BdaBuffer with all fields, even if it only has to read a subset of the fields. This MR fixes it and also contains some related fixes, e.g., for updating getRequiredFields().

assigned to @mnijhuis-tos

changed the description

added 1 commit

• e99de4f1 - Test new BdaBuffer::AddData() function

Compare with previous version

requested review from @nicolas-slusarenko

approved this merge request

added 1 commit

• 1b1e60bd - Re-arrange headers; Format number

Compare with previous version

reset approvals from @nicolas-slusarenko by pushing to the branch

requested review from @mnijhuis-tos

removed review request for @mnijhuis-tos

merged

mentioned in commit b63ab94e