Move binary math functions to Math namespace in math_funcs_binary header.

core/string/string_buffer.h

@@ -126,7 +126,7 @@ StringBuffer<SHORT_BUFFER_SIZE> &StringBuffer<SHORT_BUFFER_SIZE>::reserve(int p_
 	}
 
 	bool need_copy = string_length > 0 && buffer.is_empty();
-	buffer.resize_uninitialized(next_power_of_2((uint32_t)p_size));
+	buffer.resize_uninitialized(Math::next_power_of_2((uint32_t)p_size));
 	if (need_copy) {
 		memcpy(buffer.ptrw(), short_buffer, string_length * sizeof(char32_t));
 	}