Add icon colors to editor theme
Add icon colors to editor theme

Add `icon_normal_color`, `icon_pressed_color`, and
`icon_disabled_color` to `Button`, `OptionButton`,
`CheckButton`, and `CheckBox`.

Zylann/godot,vkbsb/godot,Zylann/godot,BastiaanOlij/godot,BastiaanOlij/godot,josempans/godot,pkowal1982/godot,ZuBsPaCe/godot,Zylann/godot,vkbsb/godot,godotengine/godot,Shockblast/godot,firefly2442/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,godotengine/godot,firefly2442/godot,godotengine/godot,Shockblast/godot,vkbsb/godot,sanikoyes/godot,vkbsb/godot,josempans/godot,ZuBsPaCe/godot,Valentactive/godot,Valentactive/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,josempans/godot,vkbsb/godot,Valentactive/godot,firefly2442/godot,ZuBsPaCe/godot,godotengine/godot,pkowal1982/godot,guilhermefelipecgs/godot,Valentactive/godot,Shockblast/godot,Zylann/godot,Zylann/godot,akien-mga/godot,pkowal1982/godot,Zylann/godot,firefly2442/godot,Valentactive/godot,Shockblast/godot,akien-mga/godot,sanikoyes/godot,firefly2442/godot,ZuBsPaCe/godot,Valentactive/godot,pkowal1982/godot,sanikoyes/godot,vkbsb/godot,akien-mga/godot,firefly2442/godot,ZuBsPaCe/godot,BastiaanOlij/godot,Zylann/godot,guilhermefelipecgs/godot,akien-mga/godot,Valentactive/godot,godotengine/godot,akien-mga/godot,vkbsb/godot,guilhermefelipecgs/godot,josempans/godot,josempans/godot,josempans/godot,josempans/godot,vkbsb/godot,BastiaanOlij/godot,Shockblast/godot,ZuBsPaCe/godot,sanikoyes/godot,Shockblast/godot,Shockblast/godot,godotengine/godot,BastiaanOlij/godot,Shockblast/godot,akien-mga/godot,akien-mga/godot,guilhermefelipecgs/godot,godotengine/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,sanikoyes/godot,BastiaanOlij/godot,BastiaanOlij/godot,pkowal1982/godot,pkowal1982/godot,Valentactive/godot,firefly2442/godot,godotengine/godot,guilhermefelipecgs/godot,pkowal1982/godot,Zylann/godot,josempans/godot,sanikoyes/godot,pkowal1982/godot,sanikoyes/godot,akien-mga/godot,firefly2442/godot,sanikoyes/godot