mod(container/element): remove origin: Point argument from Element.content function

Renamed `Container.contents` to `Container.content` to be in line with
the corresponding `Element` function name. This has also been done for
the properties structs used by the `Container`.

src/container.zig

@@ -38,7 +38,7 @@ pub const Border = packed struct {
         pub const vertical: @This() = .{ .top = true, .bottom = true };
     } = .{},
 
-    pub fn contents(this: @This(), cells: []Cell, size: Point) void {
+    pub fn content(this: @This(), cells: []Cell, size: Point) void {
         std.debug.assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
 
         const frame = switch (this.corners) {
@@ -154,7 +154,7 @@ pub const Rectangle = packed struct {
     fill: Color = .default,
 
     // NOTE caller owns `Cells` slice and ensures that `cells.len == size.x * size.y`
-    pub fn contents(this: @This(), cells: []Cell, size: Point) void {
+    pub fn content(this: @This(), cells: []Cell, size: Point) void {
         std.debug.assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
 
         for (0..size.y) |row| {
@@ -341,7 +341,7 @@ pub const Layout = packed struct {
         } = .line,
     } = .{},
 
-    pub fn contents(this: @This(), comptime C: type, cells: []Cell, origin: Point, size: Point, children: []const C) void {
+    pub fn content(this: @This(), comptime C: type, cells: []Cell, origin: Point, size: Point, children: []const C) void {
         std.debug.assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
 
         if (this.separator.enabled and children.len > 1) {
@@ -878,17 +878,17 @@ pub fn Container(comptime Event: type) type {
             }
         }
 
-        pub fn contents(this: *const @This()) ![]const Cell {
+        pub fn content(this: *const @This()) ![]const Cell {
             if (this.size.x == 0 or this.size.y == 0) return Error.TooSmall;
             const cells = try this.allocator.alloc(Cell, @as(usize, this.size.x) * @as(usize, this.size.y));
             @memset(cells, .{});
             errdefer this.allocator.free(cells);
 
-            this.properties.layout.contents(@This(), cells, this.origin, this.size, this.elements.items);
-            this.properties.border.contents(cells, this.size);
-            this.properties.rectangle.contents(cells, this.size);
+            this.properties.layout.content(@This(), cells, this.origin, this.size, this.elements.items);
+            this.properties.border.content(cells, this.size);
+            this.properties.rectangle.content(cells, this.size);
 
-            try this.element.content(cells, this.origin, this.size);
+            try this.element.content(cells, this.size);
 
             // DEBUG render corresponding top left corner of this `Container` *red*
             // cells[0].style.fg = .red;