Add bordercolor windowrule (#992)

* Add bordercolor windowrule

* remove spaces form bordercolor rule + typo

Co-authored-by: Jef Steelant <jef.steelant_ext@softathome.com>

src/Window.hpp

@@ -18,6 +18,9 @@ struct SWindowSpecialRenderData {
     float alpha = 1.f;
     float alphaInactive = -1.f; // -1 means unset
 
+    int64_t activeBorderColor = -1; // -1 means unset
+    int64_t inactiveBorderColor = -1; // -1 means unset
+
     // set by the layout
     bool rounding = true;
     bool border = true;