Integrate touch related development. (#90)

* * Add BuildActionIntention crap

* * Set Client and World projects to use MP compilation

* asd

* * Use the new BuildActionIntention to break and place blocks.

* * Reverse engineer the IArea system.

* * Copy break logic from survival into creative conditionally

* * Reverse IBuildInput and MouseHandler
* Replace the new relative paths in the client project with $(MC_ROOT) again

* * Reverse Multitouch, MouseDevice

* * Reverse a bunch of auxiliary classes for input.

* * Use CustomInputHolder instead of holding inputs manually.

* * Reverse a whole BUNCH of things!

* * Add feedback textures to the gitignore.

* * D-pad now renders! Also loads of other work.

* * More Stuff

* * Finish touch control bug fixing.

* * Finalize work.

* * One last thing..

* * Add a "cramped" mode to the options screen and start menu.

* * Oh, forgot to do something

source/world/phys/HitResult.hpp

@@ -40,6 +40,9 @@ public:
 	HitResult() { _init(); }
 	HitResult(Entity*);
 	HitResult(int x, int y, int z, eHitSide hitSide, const Vec3&);
+	bool isHit() const {
+		return m_hitType != NONE;
+	}
 
 public:
 	eHitResultType m_hitType;

source/world/phys/Vec3.hpp

@@ -12,6 +12,10 @@
 // Needed for when we're missing nullptr in multiple files
 #include "common/Utils.hpp"
 
+// NOTE: I don't think that Vec3 was implemented like that - it was
+// probably implemented just like in Java. However, I think it looks
+// nicer this way :)
+
 class Vec3
 {
 public:
@@ -75,5 +79,20 @@ public:
 	{
 		return Vec3(x + tx, y + ty, z + tz);
 	}
+
+	float lengthSqr() const
+	{
+		return x * x + y * y + z * z;
+	}
+
+	float length() const
+	{
+		return sqrt(lengthSqr());
+	}
+
+	Vec3 scale(float scale) const
+	{
+		return Vec3(x * scale, y * scale, z * scale);
+	}
 };