make hologram lifespan and transparency level configurable.

src/main/java/com/gtnewhorizon/structurelib/ClientProxy.java

@@ -328,7 +328,11 @@ public class ClientProxy extends CommonProxy {
             int brightness = w.blockExists(x, 0, z) ? w.getLightBrightnessForSkyBlocks(x, y, z, 0) : 0;
             tes.setBrightness(brightness);
 
-            tes.setColorRGBA((int) (tint[0] * .9F), (int) (tint[1] * .95F), (int) (tint[2] * 1F), 192);
+            tes.setColorRGBA(
+                    (int) (tint[0] * .9F),
+                    (int) (tint[1] * .95F),
+                    (int) (tint[2] * 1F),
+                    ConfigurationHandler.INSTANCE.getHintTransparency());
 
             for (int i = 0; i < 6; i++) {
                 if (icons[i] == null) continue;
@@ -403,7 +407,8 @@ public class ClientProxy extends CommonProxy {
                 boolean sortRequired = false;
                 // The allGroups is implicitly sorted by creationTime
                 // here we exploit this ordering to reduce iteration size
-                int deadline = Minecraft.getMinecraft().thePlayer.ticksExisted - HOLOGRAM_LIFETIME;
+                int deadline = Minecraft.getMinecraft().thePlayer.ticksExisted
+                        - ConfigurationHandler.INSTANCE.getHintLifespan();
                 int i;
                 for (i = 0; i < allGroups.size(); i++) {
                     if (allGroups.get(i).getCreationTime() > deadline) {

src/main/java/com/gtnewhorizon/structurelib/ConfigurationHandler.java

@@ -15,6 +15,8 @@ public enum ConfigurationHandler {
     private Configuration config;
     private int maxCoexistingHologram;
     private boolean removeCollidingHologram;
+    private int hintLifespan;
+    private int hintTransparency;
     private int autoPlaceBudget;
     private int autoPlaceInterval;
 
@@ -52,6 +54,15 @@ public enum ConfigurationHandler {
                 "client.hologram",
                 true,
                 "An attempt will be made to remove an existing hologram if it collides with a new hologram.");
+        hintLifespan =
+                config.getInt("hintLifespan", "client.hologram", 400, 1, 20000, "Ticks before a hologram disappears.");
+        hintTransparency = config.getInt(
+                "hintTransparency",
+                "client.hologram",
+                192,
+                1,
+                255,
+                "Alpha value of hologram particles. Higher the value, the more \"ghostly\" the hologram will appear to be.");
         autoPlaceBudget = config.getInt(
                 "autoPlaceBudget",
                 "common.hologram",
@@ -92,6 +103,14 @@ public enum ConfigurationHandler {
         return removeCollidingHologram;
     }
 
+    public int getHintLifespan() {
+        return hintLifespan;
+    }
+
+    public int getHintTransparency() {
+        return hintTransparency;
+    }
+
     public int getAutoPlaceBudget() {
         return autoPlaceBudget;
     }