Per our email discussion, I have updated the HG prompt code to use the '-ib' option to 'hg id' so the branch name is always available, regardless of the state of the working copy.
In `string.gsub()`, the `%` character has special meaning and must be escaped to be treated verbatim, otherwise the "invalid use of '%' in replacement string" warning will show up.
This adds a verbatim() function for that purpose. It fixes this warning for situations where `'%` characters are in the current path (cwd), version control branch names, or in the previous `PROMPT` set by the user.
The below enables Cmder Fast Init mode for `cmd.exe` sessions. This is more like the Cmder 1.3.5 init process. See issue #1821
Cmder Fast Init mode bypasses or disables the following Cmder 1.3.6+ features:
* Git root and version detection. Defaults to `%cmder_root%\vendor\git-for-windows` if it exists.
* Path enhance validation before path modify so `%Path%` enhancements are forced.
* Recursive path add for `"%CMDER_ROOT%\bin"`
* Recursive path add for `"%CMDER_USER_BIN%\bin"` if `/c [user_config_folder` is specified.
* `/d` switch to enable debug output.
* `/v` switch to enable debug output.
Add `/f` to Cmder task as shown below t enable fast init:
_Note 1: This setting is invalid in Cmder `Powershell` and `Bash` sessions~_
_Note 2: Add `/t` also to see init timer output_
Cuts ~2.4 seconds off of init time.
If the git found is a shim, we need to follow the path to the actual git
directory to set the GIT_INSTALL_ROOT variable.
This happens when installing git via scoop for example.
