Add option to show ligatures and glyphs on currently selected line

[triplrrr]

trafficstars

Add option in editor settings to enable font ligatures and glyphs on currently selected line, and make it on by default. The current feature is contrary to other editors and may cause confusion when configuring the editor.

Originally posted by @triplrrr in https://github.com/Embarcadero/Dev-Cpp/issues/174#issuecomment-914391806

[sitiom]

Previously mentioned by me in https://github.com/Embarcadero/Dev-Cpp/issues/41#issuecomment-720923540