1.12.1

These are the main changes from 1.12 to 1.12.1:

• Add workspace split command: splits a workspace in two, showing them both in the monitor at the same time, like having two virtual monitors.
• Lua: add view_float and workspace_create callbacks, and workspace_get_output(), workspace_get_pin(), workspace_get_pin_mode(), workspace_get_split() API functions.
• Add name_only argument to workspace swap to reorganize names of workspaces without any other changes.
• Bug fixes to Xwayland, fullscreen layout, decorations, animations, and many more.
• Incorporates the latest changes to wlroots and sway.
• Deprecated: workspace <name> exec <command> command replaced by Lua workspace rule as in this example, and window_update animation curve.