A round of replay system fixes and improvements.
* replaying the debug help window was broken in 2 ways which I fixed
* Fix#559 -- When we observe bugs in random sessions, we no longer have to regret that we didn't pass `--record` at the command line. The replay data is kept in memory and writing it out can be enabled with debug action Z.
* Recording replays into the working directory by default is pretty wonky, because the working directory is usually a build output folder that might be clobbered by a `scons -c`, wiping out important replays. Also, if the working directory is the Visual Studio project folder, you end up adding untracked files to your repo folder which can get annoying. So - I've made the default replay directory a folder alongside the tempDir that already exists. On Windows, this is in AppData, on Mac it's in Application Support, etc. But if you pass an explicitly relative or absolute path, it is resolved as expected.
* I made a mistake a while ago that made the Debug action N (end scenario) not get recorded. Fixed!
* Scenarios contain a string map of feature flags. The flag names are the keys, and flag versions are the values, so a typical value might be "fixed" for bug fixes or for evolving features, "V1", "V2", etc.
* The game has a map of flags to lists of supported versions. The game can therefore signal that it supports a legacy behavior for a given feature flag. The last version in the list is considered to be this build version's default behavior.
* When launching a scenario, we check to make sure the game supports the scenario's required versions of its feature flags.
* When launching a replay, we make sure the game supports the feature flags that the version of the game that made the recording did.
Fix#555Close#591
I have certain UI expectations, like for the Yes/No dialogs to all respond to both the Y or N key. If there's a default button that responds to Enter, I want it to do that without clobbering its existing hotkey.
Fix#600
I really didn't like the get_strs() function in boe.special.cpp which always had to get 2 strings at a time even if you only needed 1 or were going to need 6 total. I made all that code DRY and less horrifying.
I also fixed some crash bugs in various string dialogs.
