Replace deprecated capitalize() function

Signed-off-by: Graham <gpe@openrs2.org>

buffer-generator/build.gradle.kts

@@ -11,6 +11,7 @@ application {
 dependencies {
     api(libs.clikt)
 
+    implementation(projects.util)
     implementation(libs.kotlinPoet)
     implementation(libs.netty.buffer)
 }

buffer-generator/src/main/kotlin/org/openrs2/buffer/generator/IntType.kt

@@ -1,5 +1,6 @@
 package org.openrs2.buffer.generator
 
+import org.openrs2.util.capitalize
 import kotlin.reflect.KClass
 
 public enum class IntType(

deob-bytecode/src/main/kotlin/org/openrs2/deob/bytecode/remap/FieldMappingGenerator.kt

@@ -5,6 +5,7 @@ import org.openrs2.asm.MemberRef
 import org.openrs2.asm.classpath.ClassPath
 import org.openrs2.asm.filter.MemberFilter
 import org.openrs2.deob.util.map.NameMap
+import org.openrs2.util.capitalize
 import org.openrs2.util.collect.DisjointSet
 import org.openrs2.util.indefiniteArticle
 

util/src/main/kotlin/org/openrs2/util/StringUtils.kt

@@ -18,3 +18,7 @@ public fun CharSequence.krHashCode(): Int {
     }
     return hash
 }
+
+public fun String.capitalize(): String {
+    return replaceFirstChar { it.titlecase() }
+}

util/src/test/kotlin/org/openrs2/util/StringUtilsTest.kt

@@ -20,4 +20,11 @@ class StringUtilsTest {
         assertEquals(99162322, "hello".krHashCode())
         assertEquals(92340183, "h€llo".krHashCode())
     }
+
+    @Test
+    fun testCapitalize() {
+        assertEquals("Hello", "hello".capitalize())
+        assertEquals("Hello", "Hello".capitalize())
+        assertEquals("HELLO", "HELLO".capitalize())
+    }
 }