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, 1 insertions, 1 deletions

diff --git a/editor/editor_profiler.h b/editor/editor_profiler.h
index cb451475e7..d445ad58aa 100644
--- a/editor/editor_profiler.h
+++ b/editor/editor_profiler.h
@@ -136,7 +136,7 @@ private:
 	void _activate_pressed();
 	void _clear_pressed();
 
-	String _get_time_as_text(Metric &m, float p_time, int p_calls);
+	String _get_time_as_text(const Metric &m, float p_time, int p_calls);
 
 	void _make_metric_ptrs(Metric &m);
 	void _item_edited();