Add cmake build system
Add missing return for non-void function
Fix typo
Add missing return for non-void function
Merge pull request #59 from AMDmi3/warnings

Fix some warnings
Merge pull request #58 from AMDmi3/cmake

Add cmake build system
Merge pull request #60 from helgp/master

Fixed invalid path on startup err in 3 out of 4 test cases
Fixed Ctrl+[ and Ctrl+] on Windows
Issue #57: 'Select folders' option in panel settings (disabled by default)
Issue #50: Calculate size for multiple selected directories
Nicer panel footer (show free space, less useless garbage in phrasing)
Implemented FSSys::GetFileSystemFreeSpace() on Windows
Don't mention hidden files if something is selected in the panel
Reformatted all sources