Counter resets for 0.38

[Sophia]

Following up some talk in the chat with Joramun...

0.38 will include the new message M_RESET, which will reset a DSB counter's (not an "x_counter", mind you) count exvar to its initial value. This initial value is stored in the exvar base_count, and is normally automatically set by the base code to whatever count is initialized to, before the counter does anything-- so you don't normally need to worry about it. However, this also allows you to do funny tricks like have a counter start at a different value than it eventually resets to, should you care to.

This new message will be selectable in ESB, of course.