Planwindows

[Cathyhjj]

adding plan windows

[canismarko]

Fixes:

• https://github.com/spc-group/haven/issues/199
• https://github.com/spc-group/haven/issues/197
• https://github.com/spc-group/haven/issues/143
• https://github.com/spc-group/haven/issues/141

We'll need to resolve the following before merging this PR:

• https://github.com/spc-group/haven/issues/180