Refactoring and simplifying color configuration in config.h

This involves always having configuration for floating border, regardless of
whether it is used or not. Also permanently dropping the const expectation
for color configuration in dwm, so that vtcolors and xrdb patches can change
color configuration.

drw.c

@@ -291,11 +291,7 @@ void
 drw_clr_create(
 	Drw *drw,
 	Clr *dest,
-	#if BAR_VTCOLORS_PATCH
-	const char clrname[]
-	#else
 	const char *clrname
-	#endif // BAR_VTCOLORS_PATCH
 	#if BAR_ALPHA_PATCH
 	, unsigned int alpha
 	#endif // BAR_ALPHA_PATCH
@@ -326,13 +322,7 @@ drw_clr_create(
 Clr *
 drw_scm_create(
 	Drw *drw,
-	#if BAR_VTCOLORS_PATCH
-	char clrnames[][8],
-	#elif XRDB_PATCH
 	char *clrnames[],
-	#else
-	const char *clrnames[],
-	#endif // BAR_VTCOLORS_PATCH / XRDB_PATCH
 	#if BAR_ALPHA_PATCH
 	const unsigned int alphas[],
 	#endif // BAR_ALPHA_PATCH