v0.3.0 Release

This update also adds some features in preparation for the next big update.

What's new in this release:

• Added Drag&Drop importing. You can now drop .lss files into the SplitsAnalyser window and they will be imported into the program. (As referenced in issue #17)
• Added split renaming. Click on the split name to rename the split. (As referenced in issue #25)
• Added a table above the segment table, with information like SOB, PB, Total Attempts, Total possible timesave etc. (As referenced in issue #21)
• Added a settings menu in which you can't actually do anything yet but it's there! (As referenced in issue #23)
• Window location and size and now saved in program state, and will be loaded when starting up the program. (As referenced in issue #18)
• Clicking on the graph legend will now remove the corresponding line. No you can't get it back yet I'm still working on that part (so please don't submit an issue about it :P). (press the pb only/show all button to show all graph lines again) (As referenced in issue #24) (parentheses)
• The splits side menu bar thing got a bit of a makeover. It actually looks semi-decent now.
• Fixed table headers above numeric columns not being aligned to the right, in accordance to the material design spec. (As referenced in issue #19)
• Fixed bug where after importing, splits weren't visibly selected in the splits list even though they were visible in the analysis window.
• Table headers are no longer highlighted when cursor hovers over them.
• Gold segments will now highlight in gold as well, instead of transitioning to light grey like the rest of the table.
• Swapped order of Personal Best and Best Segment columns in the segment table.