Bump maturity from alpha to beta

Support for DrawList Channels

Adds:

   DrawList.channels_split(self, count: int)
   DrawList.channels_merge(self)
   DrawList.channels_set_current(self, n: int)

for #19

slimgui 0.5.0

Expose all ImGuiIO config settings

Add the below fields to the IO class:

  IO.config_nav_swap_gamepad_buttons
  IO.config_nav_move_set_mouse_pos
  IO.config_nav_capture_keyboard
  IO.config_nav_escape_clear_focus_item
  IO.config_nav_escape_clear_focus_window
  IO.config_nav_cursor_visible_auto
  IO.config_nav_cursor_visible_always
  IO.config_windows_copy_contents_with_ctrl_c
  IO.config_error_recovery
  IO.config_error_recovery_enable_assert
  IO.config_error_recovery_enable_debug_log
  IO.config_error_recovery_enable_tooltip
  IO.config_debug_is_debugger_present
  IO.config_debug_highlight_id_conflicts
  IO.config_debug_highlight_id_conflicts_show_item_picker
  IO.config_debug_begin_return_value_once
  IO.config_debug_begin_return_value_loop
  IO.config_debug_ignore_focus_loss
  IO.config_debug_ini_settings

for #16

slimgui 0.4.1

Docs updates

bump version to 0.3.2

bump version to 0.3.1

bump version to 0.3.0

bump version