changelog
    
    
    - Fri, 04 Mar 2022 11:40:19 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Fri, 04 Mar 2022 11:40:19 +0200] rev 153
 
    - Renamed modeleditcontext.cpp -> modeleditor.cpp
 
    - Fri, 04 Mar 2022 11:37:50 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Fri, 04 Mar 2022 11:37:50 +0200] rev 152
 
    - Major refactoring
- Model now just stores objects
- Document contains business logic
- Model::EditContext is now ModelEditor, no longer a nested class 
    - Thu, 03 Mar 2022 21:13:16 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 03 Mar 2022 21:13:16 +0200] rev 151
 
    - Clean up Model
 
    - Thu, 03 Mar 2022 11:42:52 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 03 Mar 2022 11:42:52 +0200] rev 150
 
    - extract polygon cache out of Model
 
    - Tue, 01 Mar 2022 17:00:19 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 01 Mar 2022 17:00:19 +0200] rev 149
 
    - work on edit history
 
    - Tue, 02 Nov 2021 15:43:57 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Tue, 02 Nov 2021 15:43:57 +0200] rev 148
 
    - reworking
 
    - Sun, 24 Oct 2021 11:33:32 +0300
 
    - by Teemu Piippo <teemu@hecknology.net> [Sun, 24 Oct 2021 11:33:32 +0300] rev 147
 
    - update