#94 and close #91. Make bookmark as plugin.
close #83 Merge Plugin tab and Feature tab
fix some bookmark plugin issues.
Add system plugin descriptions.
Optimize files.
Allow drag drop to install wox plugin.
Bug fix for drag drop plugin installer.
Revert 3bbe54bb719cf40b477161fd6486916c1da1828e
Change cwd to %USERPROFILE% before executing command.