* split out dbc file logic into separate file
* emit dbc file changed
* change to list of dbc files
* handle missing DBC file
* dbcmanager emits signal
* close existing files before loading new one
* add placeholder open for bus menu
* implement open dbc for bus
* emit signals relevant for current dbc
* move logic into findDBC
* fix use after free
* show currently loaded names in load dialog
* enable/disable load save menus
* handle saving
* add save as to recents
* handle file already open
* do not assert
* fix return and throw on file open error
* fix test maybe
* remove todo
* typo
* fix new dbc
* fix loading fingerprint on macos
* handle replacing a currently open dbc
* fix reference and handle exception
* fix indendation
old-commit-hash: 4ab2131ec9
Willem Melching
Dean Lee