Allow using up to a UTF-32 codepoint as a password asterisk (closes #715)

Signed-off-by: AnErrupTion <anerruption@disroot.org>

src/tui/TerminalBuffer.zig

@@ -202,7 +202,7 @@ pub fn drawConfinedLabel(self: TerminalBuffer, text: []const u8, x: usize, y: us
     }
 }
 
-pub fn drawCharMultiple(self: TerminalBuffer, char: u8, x: usize, y: usize, length: usize) void {
+pub fn drawCharMultiple(self: TerminalBuffer, char: u32, x: usize, y: usize, length: usize) void {
     const cell = utils.initCell(char, self.fg, self.bg);
     for (0..length) |xx| utils.putCell(x + xx, y, cell);
 }

src/tui/components/Text.zig

@@ -19,9 +19,9 @@ visible_length: usize,
 x: usize,
 y: usize,
 masked: bool,
-maybe_mask: ?u8,
+maybe_mask: ?u32,
 
-pub fn init(allocator: Allocator, buffer: *TerminalBuffer, masked: bool, maybe_mask: ?u8) Text {
+pub fn init(allocator: Allocator, buffer: *TerminalBuffer, masked: bool, maybe_mask: ?u32) Text {
     const text = DynamicString.init(allocator);
 
     return .{