Add option to match including current container name

[AlexVallat]

Adds a new option, "Match current container name". If enabled, the current container name is added as a prefix to match against, in angle brackets. This allows rules to control whether they apply based on the current container as well as the destination url.

Addresses:

• 154, #53: Change the rule to have <> prefix and it will only apply if not already in a container

• 24: Have a rule like @<(?!personal).*>mail\.google\.com , Work and it will switch to the Work container for mail.google.com unless the current container is already Personal.

• 142, Have a rule like @<google>(?!.+\.google\.com).* , No Container will allow only google.com urls in the google container

[go2null]

good to see another attempt to address these core issues. (the earlier attempt didn't make it)

• https://github.com/kintesh/containerise/pull/166

[neilyhy]

@kintesh Would you please take a look at this? This function will be very useful.