v0.2.15

feat: allow to continue if no solution is found
fix: do not load available packages if it is not needed
fix: files on a different drive than the solution could not be loaded. (related to #88)
fix: potential null pointer if non-PLC projects are in the solution
fix: if check all objects fails there is no visual indication about it besides the log
fix: added log messages on failed push or login
fix: added twinpack servers to list before connecting to any servers
fix: handle errors if connection to twinpack server can not be established (closes #89)