* Change save order of drawings to match legacy file format object order.
* Set end point of SEGVIA to start point so the round trip back to legacy
format is the same.
* Fixed bug saving and loading oval pad drill parameters.
* Fixed bug saving and loading rectangular pad deltas.
* Fixed missing layer for PCB_TARGET.
* Fixed EDA_TEXT italic bug. Thanks Dick!
* Remove some left over debug logging statements.
* Add s-expression file parser object and keyword files.
* Fix minor issues with s-expression file formatting.
* Fix a minor bug the zone container fill state parsing in the legacy plugin.
* Move EDA_TEXT visibility definition to eda_text.h.
* Add minor BOARD_ITEM object improvements to support s-expression file
parser.
* TokenList2DsnLexer.cmake now supports comments, which start with a leading
# character, and may be either on their own line or on a line after a token.
* DSNLEXER::PopReader() now pops even the last LINE_READER* and returns it.
++pcbnew:
* SPECCTRA_DB now inherits from new class SPECCTRA_LEXER, which led to a great
deal of simplification and code factoring.
* Moved specctra keywords into specctra.keywords.