Reduce unnecessary COW on Vector by make writing explicit

This commit makes operator[] on Vector const and adds a write proxy to it.  From
now on writes to Vectors need to happen through the .write proxy. So for
instance:

Vector<int> vec;
vec.push_back(10);
std::cout << vec[0] << std::endl;
vec.write[0] = 20;

Failing to use the .write proxy will cause a compilation error.

In addition COWable datatypes can now embed a CowData pointer to their data.
This means that String, CharString, and VMap no longer use or derive from
Vector.

_ALWAYS_INLINE_ and _FORCE_INLINE_ are now equivalent for debug and non-debug
builds. This is a lot faster for Vector in the editor and while running tests.
The reason why this difference used to exist is because force-inlined methods
used to give a bad debugging experience. After extensive testing with modern
compilers this is no longer the case.

1 files changed, 2 insertions, 2 deletions

diff --git a/main/tests/test_physics.cpp b/main/tests/test_physics.cpp
index 475663dabe..99c8fce70e 100644
--- a/main/tests/test_physics.cpp
+++ b/main/tests/test_physics.cpp
@@ -228,11 +228,11 @@ protected:
 
 		for (int i = 0; i < p_width; i++) {
 
-			grid[i].resize(p_height);
+			grid.write[i].resize(p_height);
 
 			for (int j = 0; j < p_height; j++) {
 
-				grid[i][j] = 1.0 + Math::random(-p_cellheight, p_cellheight);
+				grid.write[i].write[j] = 1.0 + Math::random(-p_cellheight, p_cellheight);
 			}
 		}