Project modernization (#630)

* Fixed boats falling and a TP glitch #266

* Replaced every C-style cast with C++ ones

* Replaced every C-style cast with C++ ones

* Fixed boats falling and a TP glitch #266

* Updated NULL to nullptr and fixing some type issues

* Modernized and fixed a few bugs

- Replaced most instances of `NULL` with `nullptr`.
- Replaced most `shared_ptr(new ...)` with `make_shared`.
- Removed the `nullptr` macro as it was interfering with the actual nullptr keyword in some instances.

* Fixing more conflicts

* Replace int loops with size_t and start work on overrides

Minecraft.Client/GuiParticle.cpp

@@ -24,7 +24,7 @@ GuiParticle::GuiParticle(double x, double y, double xa, double ya)
 
     friction = 1.0 / (random->nextDouble() * 0.05 + 1.01);
 
-    lifeTime = (int) (10.0 / (random->nextDouble() * 2 + 0.1));
+    lifeTime = static_cast<int>(10.0 / (random->nextDouble() * 2 + 0.1));
 }
 
 void GuiParticle::tick(GuiParticles *guiParticles)
@@ -37,7 +37,7 @@ void GuiParticle::tick(GuiParticles *guiParticles)
 
     ya += 0.1;
     if (++life > lifeTime) remove();
-    a = 2 - (life / (double) lifeTime) * 2;
+    a = 2 - (life / static_cast<double>(lifeTime)) * 2;
     if (a > 1) a = 1;
     a = a * a;
     a *= 0.5;