Added the dot-, dash-, and round-dot-line settings deletion interfaces (v2.5.103)

[simon-ritchie]

Since version v.2.5.103, the apysc supports the dot-, dash-, and round-dot-line settings deletion (delete_line_dot_setting , delete_line_dash_setting , delete_line_round_dot_setting , and delete_line_dash_dot_setting methods).

For more details, please see the following documents:

• GraphicsBase line_dot_setting interface
• GraphicsBase line_dash_setting interface
• GraphicsBase line_round_dot_setting interface
• GraphicsBase line_dash_dot_setting interface