Refactored build scripts and removed unused dependencies

- Added the following Gradle tasks:
  - buildLocal (alias for build)
  - buildCrossPlatform (builds with all natives)
  - packageDebian
  - packageWindows
- Gradle no longer downloads or packages natives for wrong platforms
(unless buildCrossPlatform or require*Dependencies is run)
- Gradle should no longer complain about deprecated features
- buildPackages.sh is now a lot more robust
- Removed the following dependencies:
  - Apache Commons Math
  - Everything in LWJGL except OpenGL/AL, GLFW, STB and core

src/main/java/ru/windcorp/progressia/common/util/FloatMathUtils.java

@@ -1,13 +1,11 @@
 package ru.windcorp.progressia.common.util;
 
-import org.apache.commons.math3.util.FastMath;
-
 public class FloatMathUtils {
 	
 	public static final float PI_F = (float) Math.PI;
 	
 	public static float floor(float x) {
-		return (float) FastMath.floor(x);
+		return (float) Math.floor(x);
 	}
 	
 	public static float normalizeAngle(float a) {