Cmder's hg prompt didn't use async prompt filtering yet.
Cmder's svn prompt only used async prompt filtering if a special config
variable was set (the commit which contributed it seems to have
misunderstood the git config settings for the git async prompt).
This commit makes the following changes:
1. Adds async prompt filtering for hg.
2. Makes async prompt filtering for svn the default.
3. Removes the prompt_overrideSvnStatusOptIn variable.
4. Fixes a bug where any errors during `svn status` in the svn prompt
accidentally show up in the terminal.
5. Fixes a bug where any errors during `hg branch` in the hg prompt
turn into Lua errors.
6. Simplifies the code for colors in the hg and svn prompts.
7. Clean up the svn prompt code and make it consistent with the git
and hg prompt code.
Add new setting value prompt_overrideSvnStatusOptIn to cmder_prompt_config.lua.default to control of asynchronous svn status update should be used with clink
The Cmder prompt normally includes version control info, which involves
running some potentially expensive commands. The cmder-powerline-prompt
project (and maybe other projects) replaces the Cmder prompt and runs
the same potentially expensive commands -- so expensive commands get run
twice!
This change makes it possible for the user and/or other scripts to
disable the version control part of the built-in Cmder prompt.
https://github.com/chrisant996/cmder-powerline-prompt
Setting `prompt_overrideGitStatusOptIn = true` will override the
`cmder.status` and `cmder.cmdstatus` git config settings and run the git
prompt status commands in the background. But it only takes effect when
using Clink v1.2.10, since that's required in order to run prompt update
commands in the background.
