Implement per-tag primary_count and primary_ratio

By default, each tag mask will use the default count and ratio. If the
mask gets modified by any of the commands, it gets added to a hash map.
When changing tag masks, the current count and ratio are stored, and
they're used again later if you switch back to that mask.

This commit also adds primary_count and primary_ratio to the general
settings for the config, so users can set a default count/ratio to use.

docs/CONFIGURATION.md

@@ -22,6 +22,12 @@ All configuration is applied top down, so later options will overwrite earlier o
 // Whether new windows should go to the top or bottom of the window stack
 attach_mode "top"
 
+// Number of windows in the primary stack
+primary_count 1
+
+// Proportion of output width taken by the primary stack
+primary_ratio 0.55
+
 // Whether mousing over a new window should move focus
 focus_follows_pointer #true
 
@@ -37,6 +43,8 @@ wallpaper_image_path "~/Pictures/wallpaper.png"
 | Setting                      | Type   | Default | Description                                         |
 |------------------------------|--------|---------|-----------------------------------------------------|
 | `attach_mode`                | enum   | `top`   | Where new windows go in the stack (`top` or `bottom`) |
+| `primary_count`              | u8     | `1`     | Number of windows in the primary stack (0+)         |
+| `primary_ratio`              | float  | `0.55`  | Proportion of output width for the primary stack (0.10–0.90) |
 | `focus_follows_pointer`      | bool   | `#true` | Focus follows the pointer between windows           |
 | `pointer_warp_on_focus_change` | bool | `#true` | Warp pointer to center of newly-focused windows     |
 | `wallpaper_image_path`       | string | none    | Path to wallpaper image                             |

docs/TODO.md

@@ -2,8 +2,6 @@
 
 These are in rough order of my priority, though no promises I do them in this order.
 
-- [ ] Implement primary count/ratio per tagmask
-- [ ] Add primary_count and primary_ratio to Config
 - [ ] Implement a river-tag-overlay clone
 - [ ] Implement an optional clock bar
 - [ ] Support window rules (float/tags/SSD by app-id/title)
@@ -26,3 +24,5 @@ These are in rough order of my priority, though no promises I do them in this or
 - [x] Add input configuration, i.e. pointer acceleration and that type of thing
 - [x] Support `None` modifier for keybinds (needed for media/brightness keys)
 - [x] Support per-host config using properties
+- [x] Implement primary count/ratio per tagmask
+- [x] Add primary_count and primary_ratio to Config