Task reuse of terminal is inconsistent

[Tyriar]

Testing #19057

• VSCode Version: Code - Insiders 1.9.0-insider (4265f5e, 2017-01-24T10:29:13.076Z)
• OS Version: Darwin x64 16.3.0
• Extensions:

Extension	Author	Version
EditorConfig	EditorConfig	0.3.4
lorem-ipsum	Tyriar	1.0.0
sort-lines	Tyriar	1.2.0
theme-glacier	Tyriar	0.0.10
vscode-svgviewer	cssho	1.3.0
gitlens	eamodio	1.4.3
git-project-manager	felipecaputo	1.0.1
md-navigate	jrieken	0.0.1
vscode-scss	mrmlnc	0.6.0
seti-icons	qinjia	0.1.3

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I ran 4 lint tasks, only the 3rd one reused the 2nd terminal instance.

[dbaeumer]

I improved the behavior for March by having a primary terminal that is always resued. However there is more to do here before I can close this:

• allow users to control this. This is requested in other issues as well
• reuse a terminal id idle if marked to be able to. For example users want to mark a terminal to not be resued to for example don't loose the result of a test run.

[dbaeumer]

This got improved in the final implementation by giving the user a property to control this. It can either be 'shared', 'dedicated', 'new'. If shared the terminal is shared between all tasks, if dedicated it is only shared between runs of the same task and if new it is never shared.