DebugTools: saner default color.

Default framebuffer clear color is black, thus having black debug
renderers by default isn't much useful.

src/DebugTools/ForceRenderer.h

@@ -44,7 +44,7 @@ See ForceRenderer documentation for more information.
 */
 class ForceRendererOptions {
     public:
-        inline constexpr ForceRendererOptions(): _size(1.0f) {}
+        inline constexpr ForceRendererOptions(): _color(1.0f), _size(1.0f) {}
 
         /** @brief Color of rendered arrow */
         inline constexpr Color4<> color() const { return _color; }
@@ -53,7 +53,7 @@ class ForceRendererOptions {
          * @brief Set color of rendered arrow
          * @return Pointer to self (for method chaining)
          *
-         * Default is black.
+         * Default is 100% opaque white.
          */
         inline ForceRendererOptions* setColor(const Color4<>& color) {
             _color = color;

src/DebugTools/ShapeRenderer.h

@@ -57,7 +57,7 @@ See ShapeRenderer documentation for more information.
 */
 class ShapeRendererOptions {
     public:
-        inline constexpr ShapeRendererOptions(): _pointSize(0.25f) {}
+        inline constexpr ShapeRendererOptions(): _color(1.0f), _pointSize(0.25f) {}
 
         /** @brief Color of rendered shape */
         inline constexpr Color4<> color() const { return _color; }
@@ -66,7 +66,7 @@ class ShapeRendererOptions {
          * @brief Set color of rendered shape
          * @return Pointer to self (for method chaining)
          *
-         * Default is black.
+         * Default is 100% opaque white.
          */
         inline ShapeRendererOptions* setColor(const Color4<>& color) {
             _color = color;